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IJ
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8814
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W
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3
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tlett
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n
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u
cted
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MO
&
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ar
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tes
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r
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n
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0
5
[
1
4
-
1
5
]
.
T
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lar
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elem
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t
s
f
r
o
m
C
1
to
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2
7
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al
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lts
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KM
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v
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is
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0
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8
1
6
w
it
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t
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T
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in
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p
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iate.
Fin
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s
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7
v
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,
th
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y
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d
e
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d
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F1
to
F6
.
T
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s
ix
f
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to
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s
ar
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o
w
to
b
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te
s
ted
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r
th
eir
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w
i
th
C
r
o
n
b
ac
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’
s
alp
h
a
co
ef
f
icien
t.
Evaluation Warning : The document was created with Spire.PDF for Python.
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2
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4
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2
8
2
276
T
ab
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1
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P
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C2
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H
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C
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C9
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10
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C
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11
G
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C
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12
G
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13
T
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14
T
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C
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15
T
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sco
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y
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mak
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n
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C
1
5
D
1
5
16
B
i
t
t
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t
a
s
t
e
of
c
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f
f
e
e
C
1
6
D
1
6
17
S
o
u
r
t
a
s
t
e
o
f
c
o
f
f
e
e
C
1
7
D
1
7
18
H
i
g
h
l
e
v
e
l
o
f
su
g
a
r
i
n
c
o
f
f
e
e
C
1
8
D
1
8
19
M
i
l
k
c
o
n
c
e
n
t
r
a
t
i
o
n
i
n
c
o
f
f
e
e
C
1
9
D
1
9
20
T
h
e
a
l
e
r
t
n
e
ss a
f
t
e
r
d
r
i
n
k
i
n
g
c
o
f
f
e
e
C
2
0
D
2
0
21
R
e
c
o
g
n
i
z
a
b
l
e
b
r
a
n
d
C
2
1
D
2
1
22
Tr
u
st
e
d
b
r
a
n
d
C
2
2
D
2
2
23
C
l
e
a
r
c
o
n
t
a
c
t
i
n
f
o
r
mat
i
o
n
o
f
t
h
e
m
a
n
u
f
a
c
t
u
r
e
r
C
2
3
D
2
3
24
D
i
f
f
e
r
e
n
t
t
y
p
e
s
of
c
o
f
f
e
e
f
r
o
m t
h
e
sa
me
b
r
a
n
d
C
2
4
D
2
4
25
T
h
e
w
i
d
e
sp
r
e
a
d
a
d
v
e
r
t
i
se
me
n
t
C
2
5
D
2
5
26
T
h
e
e
a
se
i
n
st
o
r
a
g
e
C
2
6
D
2
6
27
T
h
e
e
a
se
i
n
u
se
C
2
7
D
2
7
2
.
2
.
Relia
bil
it
y
Ana
ly
s
i
s
T
h
e
p
u
r
p
o
s
e
o
f
r
eliab
ilit
y
an
al
y
s
is
i
s
to
ass
ess
t
h
e
d
eg
r
ee
o
f
co
n
s
is
te
n
c
y
a
m
o
n
g
m
u
ltip
le
m
ea
s
u
r
e
m
e
n
t
s
o
f
a
v
ar
iab
le.
C
h
r
o
n
b
ac
h
’
s
alp
h
a
is
d
esi
g
n
ed
as
a
m
ea
s
u
r
e
o
f
in
ter
n
al
co
n
s
i
s
ten
c
y
.
C
r
o
n
b
ac
h
’
s
A
lp
h
a
is
m
o
s
t a
p
p
r
o
p
r
iatel
y
u
s
ed
w
h
e
n
th
e
ite
m
s
m
ea
s
u
r
e
d
i
f
f
er
en
t
s
u
b
s
ta
n
ti
v
e
ar
ea
s
w
i
th
i
n
a
s
i
n
g
le
co
n
s
tr
u
ct
(
Sch
m
itt,
1
9
9
6
)
[
1
6
]
.
A
lp
h
a
i
s
m
ea
s
u
r
ed
o
n
t
h
e
s
a
m
e
s
ca
le
as
a
co
r
r
elatio
n
co
ef
f
icien
t
a
n
d
t
y
p
icall
y
v
ar
ies
b
et
w
ee
n
0
an
d
1
.
I
n
r
eliab
ilit
y
a
n
al
y
s
i
s
,
w
h
en
a
f
ac
to
r
is
co
n
s
id
er
ed
co
n
s
is
te
n
t
l
y
,
C
r
o
n
b
ac
h
’
s
A
lp
h
a
is
u
s
ed
t
o
cr
ea
te
a
s
u
m
m
ar
y
s
ta
tis
tic
s
f
o
r
th
e
f
ac
t
o
r
s
in
th
e
“
i
m
p
o
r
tan
ce
le
v
el”
an
d
r
elev
an
t
v
ar
iab
les
in
t
h
e
“satis
f
ac
tio
n
lev
el”.
T
h
en
b
ased
o
n
th
e
m
in
i
m
u
m
,
m
ea
n
,
an
d
m
a
x
i
m
u
m
v
al
u
es
o
f
ea
ch
f
ac
to
r
.
C
r
o
n
b
ac
h
’
s
A
lp
h
a
is
co
m
p
ar
ed
to
g
eth
er
to
k
n
o
w
w
h
e
th
er
V
ietn
a
m
co
f
f
ee
h
a
s
s
ati
s
f
ied
its
cu
s
to
m
er
s
to
w
h
at
ex
te
n
t.
I
n
th
is
p
ap
er
,
th
e
C
r
o
n
b
ac
h
’
s
alp
h
a
co
e
f
f
ic
ien
t
w
h
ile
r
u
n
n
in
g
SP
SS
s
tatis
t
ics
is
0
.
6
9
5
in
av
er
ag
e,
th
i
s
in
d
i
ca
tes
th
at
all
ite
m
s
h
av
e
s
tr
o
n
g
l
y
h
i
g
h
in
ter
n
al
co
n
s
i
s
te
n
c
y
.
T
h
is
h
elp
to
f
i
n
d
o
u
t
t
h
e
g
ap
b
et
w
ee
n
th
e
c
u
s
to
m
er
s
e
x
p
ec
tatio
n
o
n
th
eir
u
s
in
g
co
f
f
ee
an
d
t
h
e
ac
tu
al
p
er
f
o
r
m
a
n
ce
o
f
Viet
n
a
m
co
f
f
ee
co
m
p
an
ie
s
b
ased
o
n
th
eir
j
u
d
g
m
en
ts
.
A
s
p
er
th
e
ab
o
v
e
r
eliab
ilit
y
a
n
al
y
s
is
,
all
o
f
t
h
e
s
i
x
f
ac
to
r
s
ex
tr
ac
te
d
ar
e
r
eliab
le
f
o
r
f
u
r
th
er
a
n
al
y
s
i
s
.
B
a
s
ed
o
n
th
e
v
alu
e
s
o
f
m
ea
n
o
f
th
e
i
m
p
o
r
tan
ce
lev
el,
t
h
e
s
i
x
f
ac
to
r
s
ar
e
r
an
k
ed
as i
n
T
ab
le
2
.
T
ab
le
2
.
R
an
k
th
e
I
m
p
o
r
tan
ce
o
f
Six
Facto
r
s
in
t
h
e
Dec
i
s
io
n
-
Ma
k
i
n
g
R
a
n
k
#
F
a
c
t
o
r
A
b
o
u
t
M
e
a
n
M
i
n
M
a
x
1
F3
S
me
l
l
,
sp
e
c
i
a
l
f
l
a
v
o
r
,
h
i
g
h
c
o
n
c
e
n
t
r
a
t
i
o
n
s,
e
x
p
i
r
y
t
i
me
,
n
e
t
w
e
i
g
h
t
4
.
0
3
4
3
.
9
0
5
4
.
2
2
0
2
F5
M
i
l
k
c
o
n
c
e
n
t
r
a
t
i
o
n
s,
su
g
a
r
l
e
v
e
l
3
.
8
9
3
3
.
8
5
5
3
.
9
3
0
3
F2
L
a
n
g
u
a
g
e
s p
r
i
n
t
e
d
,
p
r
o
mo
t
i
o
n
p
r
o
g
r
a
ms,
p
a
c
k
a
g
i
n
g
e
a
sy
t
e
a
r
,
p
r
e
se
n
t
a
b
l
e
p
a
c
k
a
g
i
n
g
3
.
8
4
6
3
.
6
4
0
4
.
0
1
0
4
F4
B
r
a
n
d
,
a
d
v
e
r
t
i
se
me
n
t
s
3
.
7
6
0
3
.
5
8
8
4
.
0
4
5
5
F1
T
i
me
o
f
k
e
e
p
i
n
g
sme
l
l
,
t
a
st
e
,
c
o
l
o
r
3
.
5
1
9
3
.
3
4
5
3
.
6
8
5
6
F6
V
a
r
i
o
u
s
t
y
p
e
s,
c
o
n
t
a
c
t
i
n
f
o
r
mat
i
o
n
3
.
4
2
0
3
.
4
0
7
3
.
4
2
2
B
ased
o
n
th
e
ab
o
v
e
T
ab
le,
co
n
s
u
m
er
s
i
n
T
ai
w
a
n
p
a
y
m
o
s
t
atten
tio
n
to
f
i
v
e
ch
ar
ac
ter
i
s
tic
s
o
f
co
f
f
ee
,
in
cl
u
d
in
g
:
s
m
ell,
s
p
ec
ial
f
lav
o
r
,
h
ig
h
co
n
ce
n
tr
ati
o
n
s
o
f
co
f
f
ee
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ex
p
ir
y
ti
m
e
a
n
d
n
et
w
ei
g
h
t
p
er
p
ac
k
ag
e.
T
h
i
s
is
th
e
f
ir
s
t
d
eter
m
in
a
n
t
o
f
d
ec
is
io
n
-
m
ak
i
n
g
o
f
T
ai
w
an
e
s
e
in
b
u
y
i
n
g
t
h
eir
f
a
v
o
r
ite
co
f
f
ee
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T
h
e
s
ec
o
n
d
d
eter
m
in
a
n
t
i
s
t
h
e
m
il
k
co
n
ce
n
tr
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n
a
n
d
s
u
g
ar
lev
el
in
th
e
p
ac
k
ag
e.
Ot
h
er
f
o
u
r
d
eter
m
i
n
an
t
s
a
r
e
also
v
er
y
i
m
p
o
r
tan
t.
An
y
co
m
p
a
n
y
d
o
in
g
b
u
s
i
n
es
s
in
co
f
f
ee
i
n
d
u
s
tr
y
s
h
o
u
ld
ta
k
e
all
o
f
t
h
ese
s
i
x
f
ac
to
r
s
i
n
to
t
h
eir
Evaluation Warning : The document was created with Spire.PDF for Python.
IJ
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Th
e
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mp
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to
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a
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Ta
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a
n
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fa
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…
(
Th
i Nh
a
m
Le
)
277
co
n
s
id
er
atio
n
to
cr
ea
te
p
r
o
p
er
ac
tio
n
s
to
m
ee
t
th
eir
c
u
s
to
m
er
s
’
e
x
p
ec
tatio
n
s
.
W
ith
th
e
s
i
x
d
eter
m
i
n
a
n
ts
,
t
h
e
cu
s
to
m
er
s
’
e
x
p
ec
tatio
n
s
o
n
e
a
ch
f
ac
to
r
ar
e
alr
ea
d
y
s
h
o
w
n
u
n
d
er
t
h
e
m
ea
n
,
m
i
n
i
m
u
m
a
n
d
m
ax
i
m
u
m
v
al
u
es
s
u
m
m
ar
ized
in
T
ab
le
2
.
B
ased
o
n
th
e
ite
m
s
i
n
t
h
ese
f
ac
to
r
s
,
th
e
c
u
s
to
m
er
s
ati
s
f
ac
tio
n
le
v
el
to
Vietn
a
m
co
f
f
e
e
is
ac
co
r
d
in
g
l
y
ca
lc
u
lated
.
T
ab
le
3
s
h
o
w
s
t
h
e
co
r
r
esp
o
n
s
iv
e
ite
m
s
b
et
w
ee
n
i
m
p
o
r
ta
n
ce
lev
el
a
n
d
th
e
s
atis
f
ac
tio
n
lev
el.
Fro
m
d
ata
o
f
T
ab
le
3
,
th
e
m
ea
n
,
m
i
n
i
m
u
m
a
n
d
m
a
x
i
m
u
m
v
a
lu
es
o
f
th
e
s
i
x
f
ac
to
r
s
in
t
h
e
s
a
tis
f
ac
tio
n
lev
el
ar
e
ca
lcu
lated
b
y
th
e
r
el
i
ab
ilit
y
a
n
al
y
s
i
s
a
n
d
s
h
o
w
n
i
n
T
ab
le
4
.
Fro
m
co
m
p
ar
i
n
g
t
h
e
F
ig
u
r
es
in
T
ab
le
4
,
it
ca
n
b
e
s
ee
n
t
h
at
Viet
n
a
m
c
o
f
f
ee
h
as
w
ell
p
er
f
o
r
m
ed
i
n
F
1
an
d
F6
.
Ho
w
e
v
er
,
th
e
p
r
o
d
u
cts
d
o
n
o
t
m
ee
t
th
e
cu
s
to
m
er
s
’
e
x
p
ec
tatio
n
s
in
r
em
ai
n
in
g
f
o
u
r
f
ac
to
r
s
,
i
n
cl
u
d
i
n
g
F2
,
F3
,
F4
a
n
d
F5
.
T
ab
le
6
d
e
m
o
n
s
tr
ate
s
t
h
e
d
etails
o
f
th
e
s
a
tis
f
ac
tio
n
le
v
el
o
n
ea
ch
f
ac
to
r
c
o
m
p
ar
ed
to
r
e
lev
an
t
i
m
p
o
r
tan
ce
le
v
el.
I
t
in
d
icate
s
ea
ch
ite
m
in
th
e
ab
o
v
e
f
ac
to
r
s
o
f
b
o
th
s
at
is
f
ac
t
io
n
le
v
el
an
d
i
m
p
o
r
tan
t
lev
el,
w
h
ic
h
v
al
u
es
Viet
n
a
m
co
f
f
ee
co
m
p
an
ies
s
h
o
u
ld
p
u
t
m
o
r
e
e
f
f
o
r
ts
i
n
o
r
d
er
to
b
e
s
u
cc
e
s
s
f
u
l i
n
its
d
ev
el
o
p
m
e
n
t.
T
h
e
m
ea
n
o
f
ea
ch
i
te
m
ca
lc
u
lated
h
er
e
i
s
d
o
n
e
w
it
h
th
e
s
i
m
p
le
a
v
er
ag
e
m
eth
o
d
w
h
ic
h
is
d
i
f
f
er
e
n
t
f
r
o
m
t
h
e
ab
o
v
e
m
ea
n
s
ca
lc
u
la
t
ed
u
n
d
er
r
eliab
ilit
y
an
al
y
s
is
.
T
ab
le
3
.
C
o
r
r
esp
o
n
s
iv
e
I
te
m
s
B
et
w
ee
n
I
m
p
o
r
tan
t
L
e
v
el
An
d
Satis
f
ac
t
io
n
L
e
v
el
F
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IJ
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Vo
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3
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2
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278
Ta
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6
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ter
d
eter
m
i
n
in
g
t
h
e
p
ar
a
m
eter
s
,
it
i
s
n
ec
ess
ar
y
to
tes
t
th
e
s
ig
n
i
f
ica
n
ce
o
f
th
e
o
v
er
all
m
o
d
el
an
d
ea
ch
r
e
g
r
ess
io
n
co
e
f
f
icie
n
ts
.
T
h
e
s
i
g
n
i
f
ica
n
ce
o
f
t
h
e
o
v
er
all
m
o
d
el
i
s
d
eter
m
in
ed
b
y
co
m
p
ar
i
n
g
t
h
e
s
i
g
n
i
f
ica
n
ce
o
f
F
-
s
tati
s
tic
(
F
-
s
i
g
.
)
b
y
An
o
v
a
s
tati
s
tic
[
1
8
-
1
9
]
.
T
h
e
g
i
v
e
n
s
ig
n
i
f
ica
n
ce
lev
el
i
s
u
s
u
a
ll
y
ac
ce
p
ted
at
0
.
0
5
(
o
r
5
%).
I
n
t
h
is
s
ec
tio
n
,
an
o
t
h
er
an
a
l
y
s
is
ca
lled
r
eg
r
e
s
s
io
n
a
n
al
y
s
is
is
u
s
ed
to
e
v
al
u
ate
t
h
e
r
o
le
o
f
e
ac
h
f
ac
to
r
to
th
e
o
v
er
all
s
atis
f
ac
tio
n
le
v
e
l
to
Vietn
a
m
co
f
f
ee
.
I
n
r
eg
r
ess
io
n
an
al
y
s
i
s
,
th
e
o
v
er
all
s
ati
s
f
ac
tio
n
lev
el
(
co
d
ed
as
v
ar
iab
le
E
)
is
th
e
d
ep
en
d
en
t
v
ar
iab
le
an
d
th
e
s
ix
f
ac
to
r
s
a
r
e
in
d
ep
en
d
en
t
v
ar
iab
les.
T
h
e
an
al
y
s
is
r
es
u
lt
s
ar
e
as in
T
ab
le
7
.
T
ab
le
6
also
s
h
o
w
s
th
a
t
T
ai
w
an
ese
p
eo
p
le
ar
e
p
ay
i
n
g
m
o
s
t
atten
tio
n
to
th
e
s
m
ell
o
f
th
e
c
o
f
f
ee
a
f
ter
m
ak
in
g
,
also
its
s
p
ec
ial
f
la
v
o
r
,
th
e
ea
s
e
o
f
tear
in
g
t
h
e
p
ac
k
a
g
e
an
d
th
e
b
r
an
d
.
A
ll
o
f
t
h
ese
ele
m
en
ts
h
a
v
e
t
h
e
m
ea
n
v
al
u
es
o
f
m
o
r
e
th
a
n
4
p
o
in
ts
in
t
h
e
s
ca
le
o
f
5
p
o
in
ts
an
d
th
e
y
ar
e
in
3
f
ac
to
r
s
th
at
ar
e
to
p
r
an
k
ed
in
th
e
s
ix
d
eter
m
in
a
n
t
s
f
o
u
n
d
.
I
n
o
r
d
er
to
w
i
n
th
i
s
m
ar
k
et,
Vie
tn
a
m
m
u
s
t
b
e
a
w
ar
e
o
f
its
co
f
f
ee
p
er
f
o
r
m
a
n
ce
as
p
er
th
e
ev
al
u
atio
n
o
f
ea
ch
s
p
ec
if
ic
ele
m
en
t s
h
o
w
n
i
n
T
ab
le
6
.
Evaluation Warning : The document was created with Spire.PDF for Python.
IJ
AA
S
I
SS
N:
2252
-
8814
Th
e
E
mp
ir
ica
l A
n
a
lysi
s
to
E
n
h
a
n
ce
Ta
iw
a
n
ese
S
a
tis
fa
ctio
n
…
(
Th
i Nh
a
m
Le
)
279
2
.
3
.
Reg
re
s
s
io
n Ana
ly
s
is
Af
ter
u
s
i
n
g
r
eliab
ilit
y
a
n
al
y
s
i
s
m
eth
o
d
to
co
m
p
ar
e
ele
m
e
n
t
s
w
it
h
o
t
h
er
s
a
n
d
to
f
in
d
o
u
t
th
e
r
o
le
o
f
ea
ch
ele
m
en
t
in
cr
ea
ti
n
g
s
at
is
f
ied
o
f
cu
s
to
m
er
s
w
h
o
h
av
e
e
x
p
er
ien
ce
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e
n
j
o
y
i
n
g
Viet
n
a
m
co
f
f
ee
.
R
eg
r
es
s
io
n
An
al
y
s
i
s
m
et
h
o
d
is
u
s
ed
to
an
al
y
ze
t
h
ese
ele
m
e
n
ts
to
d
eter
m
i
n
e
t
h
e
s
ta
te
o
f
c
u
s
to
m
e
r
'
s
s
ati
s
f
ac
t
io
n
f
o
r
r
e
m
ain
in
g
ad
v
a
n
ta
g
es a
n
d
i
m
p
r
o
v
in
g
d
is
ad
v
a
n
tag
e
s
o
f
t
h
ese
ele
m
e
n
ts
f
o
r
Vietn
a
m
co
f
f
ee
’
s
d
ev
elo
p
m
e
n
t.
I
n
s
tati
s
tic
s
,
r
eg
r
es
s
io
n
a
n
al
y
s
is
is
a
s
tati
s
tical
m
et
h
o
d
t
o
k
n
o
w
t
h
e
r
elatio
n
s
h
ip
s
b
et
w
ee
n
v
ar
iab
les.
R
eg
r
es
s
io
n
a
n
al
y
s
i
s
i
n
cl
u
d
es
m
an
y
tec
h
n
iq
u
e
s
f
o
r
m
o
d
eli
n
g
an
d
a
n
al
y
zin
g
s
o
m
e
v
ar
iab
l
es,
f
o
cu
s
i
n
g
o
n
t
h
e
r
elatio
n
s
h
ip
b
et
w
ee
n
a
d
ep
en
d
en
t
v
ar
iab
le
an
d
o
n
e
o
r
m
o
r
e
in
d
ep
en
d
en
t
v
ar
iab
les.
Sp
ec
if
icall
y
,
r
eg
r
es
s
io
n
an
al
y
s
is
h
elp
s
r
esear
ch
er
u
n
d
er
s
tan
d
h
o
w
th
e
t
y
p
ical
v
al
u
e
o
f
th
e
d
ep
en
d
en
t
v
ar
iab
le
ch
a
n
g
e
s
w
h
e
n
an
y
o
n
e
o
f
th
e
in
d
ep
en
d
e
n
t
v
ar
iab
l
es
is
c
h
an
g
ed
,
w
h
ile
t
h
e
o
th
er
in
d
ep
en
d
en
t
v
ar
iab
l
es
ar
e
h
eld
f
ix
ed
(
Hair
et
al,
2
0
1
0
)
[
1
7
]
.
T
h
e
f
o
r
m
u
lat
io
n
o
f
r
eg
r
e
s
s
io
n
an
al
y
s
is
i
s
s
h
o
w
n
a
s
th
e
f
o
llo
w
i
n
g
:
0
1
1
2
2
nn
y
a
a
x
a
x
a
x
(4
)
I
n
h
er
e:
a
0
:
I
n
ter
ce
p
t.
a
1
, a
2
…
a
n
:
R
eg
r
es
s
io
n
co
e
f
f
ic
ien
t
s
.
x
1
, x
2
,
…,
x
n
:
I
n
d
ep
en
d
en
t v
ar
iab
le
s
.
y
:
Dep
en
d
en
t v
ar
iab
le
:
E
r
r
o
r
T
h
e
m
et
h
o
d
o
f
least
s
q
u
ar
es
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s
a
s
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d
ar
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ap
p
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h
to
th
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a
p
p
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te
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tio
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er
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d
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s
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te
m
s
o
r
in
ex
ac
tl
y
s
p
ec
if
ied
s
y
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te
m
s
.
"
L
ea
s
t
s
q
u
ar
e
s
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m
ea
n
s
t
h
at
t
h
e
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v
er
all
s
o
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tio
n
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i
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m
izes
t
h
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u
m
o
f
th
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s
q
u
ar
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th
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er
r
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ad
e
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t
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r
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f
e
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y
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i
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g
l
e
eq
u
atio
n
.
T
h
is
m
et
h
o
d
d
ef
i
n
es
th
e
est
i
m
a
te
o
f
th
ese
p
ar
a
m
eter
s
an
d
d
ef
i
n
ed
as f
o
llo
w
i
n
g
f
o
r
m
u
la:
ni
n
i
i
i
i
i
x
a
x
a
a
y
y
y
...
ˆ
1
1
0
1
,
2
,
3
,
.
.
.
im
(5
)
An
d
th
e
O
L
S
m
et
h
o
d
is
s
h
o
w
n
as
f
o
llo
w
:
mi
n
1
2
m
i
i
(
6
)
No
w
th
e
p
ar
a
m
eter
s
a
0
,
a
1
,
a
2
…
a
n
in
th
e
r
eg
r
ess
io
n
m
o
d
els
ar
e
ea
s
ily
o
b
tain
ed
b
ec
au
s
e
o
f
th
e
g
r
ea
t
ad
v
an
ce
s
i
n
co
m
p
u
ter
tech
n
o
l
o
g
y
a
n
d
s
o
f
t
w
ar
e.
Af
ter
d
eter
m
in
i
n
g
t
h
e
p
ar
a
m
e
ter
s
,
it
is
n
ec
e
s
s
ar
y
to
tes
t
t
h
e
s
ig
n
i
f
ica
n
ce
o
f
th
e
o
v
er
all
m
o
d
e
l
an
d
ea
ch
r
eg
r
e
s
s
io
n
co
ef
f
icie
n
t
s
.
T
h
e
s
i
g
n
i
f
ica
n
ce
o
f
t
h
e
o
v
er
all
m
o
d
el
is
d
eter
m
i
n
ed
b
y
co
m
p
ar
i
n
g
t
h
e
s
ig
n
i
f
ica
n
ce
o
f
F
-
s
tati
s
tic
(
F
-
s
ig
.
)
b
y
An
o
v
a
s
tati
s
tic
[
1
8
-
1
9
]
.
T
h
e
g
iv
e
n
s
ig
n
i
f
ica
n
ce
lev
el
is
u
s
u
all
y
ac
ce
p
ted
at
0
.
0
5
(
o
r
5
%).
I
n
t
h
is
s
ec
tio
n
,
an
o
t
h
er
an
a
l
y
s
is
ca
lled
r
eg
r
e
s
s
io
n
a
n
al
y
s
is
is
u
s
ed
to
e
v
al
u
ate
t
h
e
r
o
le
o
f
e
ac
h
f
ac
to
r
to
th
e
o
v
er
all
s
atis
f
ac
tio
n
le
v
e
l
to
Vietn
a
m
co
f
f
ee
.
I
n
r
eg
r
ess
io
n
an
al
y
s
i
s
,
th
e
o
v
er
all
s
ati
s
f
ac
tio
n
lev
el
(
co
d
ed
as
v
ar
iab
le
E
)
is
th
e
d
ep
en
d
en
t
v
ar
iab
le
an
d
th
e
s
ix
f
a
cto
r
s
a
r
e
in
d
ep
en
d
en
t
v
ar
iab
les.
T
h
e
an
al
y
s
is
r
es
u
lt
s
ar
e
as in
T
ab
le
7
.
T
ab
le
7
.
C
o
ef
f
icie
n
ts
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8814
IJ
AA
S
Vo
l.
6
,
No
.
3
,
Sep
tem
b
er
2
0
1
7
:
2
7
4
–
2
8
2
280
Fro
m
T
ab
le
7
,
it
ca
n
b
e
co
n
cl
u
d
ed
th
at
F1
,
F2
an
d
F3
ar
e
s
tatis
ticall
y
s
ig
n
i
f
ica
n
t
in
t
h
is
r
eg
r
ess
io
n
m
o
d
el.
An
o
v
a
an
a
l
y
s
is
is
co
n
d
u
ct
ed
to
test
t
h
e
m
o
d
el
f
i
t
a
s
in
T
ab
le
7
w
h
ic
h
r
ec
o
n
f
ir
m
s
th
at
t
h
e
m
o
d
el
is
f
i
t
to
th
e
ac
tu
al
p
h
e
n
o
m
en
o
n
an
d
g
o
o
d
en
o
u
g
h
to
u
s
e
i
n
t
h
is
s
tu
d
y
.
A
cc
o
r
d
in
g
to
T
ab
le
6
,
w
it
h
th
e
g
iv
e
n
s
i
g
n
i
f
ica
n
ce
o
f
5
%,
F4
,
F5
an
d
F6
ar
e
n
o
t
co
n
s
id
er
ed
s
tatis
t
icall
y
s
i
g
n
if
ica
n
t
b
ec
au
s
e
th
eir
s
i
g
n
if
ic
a
n
ce
v
alu
e
s
ar
e
g
r
ea
ter
th
a
n
th
e
g
i
v
en
o
n
e.
T
h
u
s
,
th
e
s
e
v
ar
iab
les
ar
e
o
n
e
-
by
-
o
n
e
d
r
o
p
p
ed
o
u
t
o
f
t
h
e
r
e
g
r
ess
io
n
m
o
d
el.
T
h
e
f
i
n
al
r
es
u
lt
s
f
r
o
m
r
e
g
r
es
s
io
n
a
n
al
y
s
i
s
ar
e
p
r
ese
n
ted
in
T
ab
le
8
.
T
ab
le
8
.
A
n
o
v
a
An
al
y
s
i
s
F2
h
as
th
e
h
ig
h
est
v
alu
e
o
f
s
t
an
d
ar
d
iz
ed
co
ef
f
icien
t
“
B
eta”
,
F1
co
m
es
n
e
x
t
an
d
F3
h
as
t
h
e
lo
w
e
s
t.
T
h
is
in
d
icate
s
t
h
at
F2
h
a
s
th
e
s
tr
o
n
g
e
s
t
i
m
p
ac
t
o
n
t
h
e
o
v
er
all
s
atis
f
ac
tio
n
lev
el
o
f
th
e
c
u
s
to
m
er
s
;
F1
co
m
es
s
ec
o
n
d
;
F3
co
m
e
s
th
ir
d
;
w
h
er
ea
s
,
F4
,
F5
an
d
F6
d
o
n
o
t
h
a
v
e
an
y
e
f
f
ec
t
o
n
th
e
o
v
er
all
s
a
ti
s
f
ac
tio
n
le
v
el
o
f
t
h
e
cu
s
to
m
er
s
to
w
ar
d
s
Viet
n
a
m
c
o
f
f
ee
.
T
h
er
e
ar
e
6
m
aj
o
r
d
eter
m
i
n
an
t
s
af
f
ec
ti
n
g
th
e
d
ec
is
io
n
-
m
ak
i
n
g
in
b
u
y
in
g
co
f
f
ee
o
f
cu
s
to
m
er
.
T
h
ese
6
d
eter
m
i
n
an
t
s
ar
e
r
esu
lted
f
r
o
m
an
al
y
s
is
s
u
r
v
e
y
ed
d
ata
b
y
SP
SS
s
tat
is
tic
s
.
T
h
ese
f
ac
to
r
s
ar
e
v
er
y
i
m
p
o
r
ta
n
t
i
n
m
ee
t
in
g
cu
s
to
m
er
s
’
e
x
p
ec
tatio
n
.
T
h
er
ef
o
r
e,
in
o
r
d
er
to
d
o
m
i
n
ate
T
ai
w
a
n
m
ar
k
et,
Vie
tn
a
m
co
f
f
ee
s
h
o
u
l
d
p
u
t
m
o
r
e
atten
tio
n
to
m
ee
t c
u
s
to
m
er
s
’
s
ati
s
f
ac
tio
n
b
ased
o
n
th
e
s
e
f
ac
to
r
s
.
3.
RE
SUL
T
S AN
D
DIS
CUS
SI
O
NS
T
h
e
f
in
d
i
n
g
s
o
f
t
h
e
m
ai
n
d
et
er
m
in
a
n
t
s
w
i
ll
h
elp
th
o
s
e
co
f
f
ee
ex
p
o
r
ter
s
cr
ea
te
g
o
o
d
s
tr
ateg
ies
f
o
r
th
eir
lo
n
g
ter
m
d
e
v
elo
p
m
e
n
t.
Ho
w
e
v
er
,
en
h
a
n
ci
n
g
t
h
e
cu
r
r
en
t
s
ati
s
f
ac
t
io
n
lev
el
o
f
t
h
e
cu
s
to
m
er
s
al
w
a
y
s
f
ac
e
w
it
h
d
i
f
f
ic
u
lt
ies
o
n
s
e
v
er
e
co
m
p
e
titi
v
e
m
ar
k
et.
T
h
er
ef
o
r
e,
it
is
an
u
r
g
e
n
t
r
eq
u
ir
e
m
e
n
t
f
o
r
Vietn
a
m
co
f
f
ee
in
d
u
s
tr
y
to
h
a
v
e
p
r
o
p
er
s
o
lu
tio
n
s
to
en
h
a
n
ce
its
c
u
s
to
m
er
s
ati
s
f
ac
tio
n
.
Fu
r
t
h
er
to
th
e
r
es
u
lt
s
in
T
ab
le
7
,
th
er
e
ar
e
th
r
ee
m
ai
n
f
ac
to
r
s
af
f
ec
ti
n
g
th
e
o
v
er
all
s
at
is
f
ac
tio
n
lev
e
l
o
f
th
e
cu
s
to
m
er
s
o
f
Viet
n
a
m
c
o
f
f
ee
.
T
h
e
y
ar
e
lis
ted
in
T
ab
le
9
.
Am
o
n
g
th
e
th
r
ee
f
ac
to
r
s
,
F2
h
as
th
e
s
tr
o
n
g
es
t
in
f
lu
e
n
ce
o
n
th
e
o
v
er
all
s
ati
s
f
ac
tio
n
,
F1
an
d
F3
co
m
e
in
s
e
co
n
d
an
d
th
ir
d
,
r
esp
ec
tiv
el
y
.
C
u
r
r
en
tl
y
,
Viet
n
a
m
co
f
f
ee
h
as
a
v
er
y
g
o
o
d
p
er
f
o
r
m
an
ce
i
n
ter
m
s
o
f
ti
m
e
o
f
k
ee
p
in
g
g
o
o
d
s
m
ell,
t
h
e
v
i
s
co
s
it
y
,
tast
e
a
n
d
co
lo
r
af
ter
m
a
k
i
n
g
w
h
ic
h
ar
e
th
e
ele
m
en
ts
o
f
f
ac
to
r
F1
.
T
h
er
ef
o
r
e,
it
is
o
b
v
io
u
s
l
y
t
h
at
Viet
n
a
m
co
f
f
ee
co
m
p
an
ie
s
s
h
o
u
ld
tak
e
th
i
s
f
ac
to
r
F1
as
i
ts
s
tr
en
g
t
h
o
n
th
e
m
ar
k
et
;
an
d
in
th
i
s
s
ec
tio
n
,
s
o
m
e
s
o
lu
tio
n
s
ar
e
s
u
g
g
es
ted
to
en
h
a
n
ce
t
h
e
cu
r
r
e
n
t
s
at
is
f
ac
ti
o
n
lev
el
o
n
F2
an
d
F3
o
n
l
y
.
T
h
er
ef
o
r
e,
th
is
s
ec
tio
n
p
r
o
v
id
es
s
o
m
e
v
al
u
ed
s
o
lu
tio
n
s
in
o
r
d
er
to
im
p
r
o
v
e
T
ai
w
an
e
s
e
p
eo
p
le’
s
s
ati
s
f
a
ctio
n
an
d
ex
p
ec
tatio
n
i
n
u
s
i
n
g
Viet
n
a
m
co
f
f
ee
b
r
an
d
s
.
3
.
1
.
So
lutio
ns
f
o
r
E
nh
a
ncing
t
he
Sa
t
is
f
a
ct
io
n L
ev
el
o
n F
2
T
aiw
a
n
ese
c
u
s
to
m
er
s
ar
e
cu
r
r
en
tl
y
u
n
h
ap
p
y
w
it
h
th
e
p
ac
k
ag
i
n
g
o
f
Viet
n
a
m
co
f
f
ee
r
eg
ar
d
in
g
lan
g
u
a
g
e
p
r
in
ted
o
n
t
h
e
p
ac
k
a
g
e,
ea
s
e
o
f
tear
i
n
g
th
e
p
ac
k
a
g
e,
ab
ilit
y
to
u
s
e
th
e
p
ac
k
a
g
e
f
o
r
p
r
esen
t
as
w
e
ll
as
th
e
p
r
o
m
o
tio
n
p
r
o
g
r
a
m
o
f
f
er
e
d
b
y
Viet
n
a
m
co
f
f
ee
co
m
p
a
n
i
es
.
T
h
ese
ele
m
e
n
ts
ar
e
all
i
n
f
ac
to
r
F2
.
B
ased
o
n
th
e
r
esu
lts
i
n
tab
le
5
,
Vietn
a
m
co
f
f
ee
ca
n
o
n
l
y
s
ati
s
f
y
ab
o
u
t 8
5
% o
f
th
e
cu
s
to
m
er
ex
p
ec
tatio
n
s
.
Ho
w
e
v
er
,
th
e
cu
r
r
en
t
p
ac
k
ag
e
o
f
Vietn
a
m
co
f
f
ee
is
n
o
t
h
i
g
h
l
y
e
v
alu
a
ted
b
ec
au
s
e
th
er
e
ar
e
f
if
tee
n
s
ac
h
et
s
i
n
a
s
o
f
t
p
ap
er
b
o
x
w
h
ich
i
s
ea
s
il
y
cr
u
s
h
ed
u
n
d
er
a
l
ig
h
t
p
r
ess
u
r
e.
He
n
ce
,
o
n
ce
it
i
s
cr
u
s
h
ed
,
t
h
e
u
tter
b
o
x
is
u
s
u
all
y
t
h
r
o
w
n
a
w
a
y
a
f
ter
th
e
p
ac
k
s
ar
e
p
ic
k
ed
o
u
t
wh
ich
r
es
u
lts
in
a
f
ee
lin
g
o
f
i
n
c
o
n
v
e
n
ien
ce
to
s
to
r
e
th
e
co
f
f
ee
-
m
ak
in
g
th
e
c
u
s
to
m
er
u
n
h
ap
p
y
an
d
d
is
-
s
at
is
f
ie
d
.
I
n
o
r
d
er
t
o
m
a
k
e
Vietn
a
m
co
f
f
ee
tin
p
ac
k
a
g
e
d
if
f
er
f
r
o
m
t
h
o
s
e
o
f
it
s
co
m
p
etito
r
s
,
it
is
s
u
g
g
ested
t
h
at
V
i
etn
a
m
ese
co
f
f
ee
co
m
p
an
ie
s
s
h
o
u
ld
d
esi
g
n
s
p
ec
ial
s
h
ap
es
a
n
d
p
ac
k
ag
i
n
g
m
a
ter
i
als,
s
u
c
h
as
w
o
o
d
,
b
a
m
b
o
o
,
etc
.
T
h
is
is
th
e
m
ai
n
r
ea
s
o
n
w
h
y
c
u
s
to
m
er
s
ar
e
s
at
is
f
ied
o
n
l
y
8
5
.
2
% o
f
th
eir
ex
p
ec
tatio
n
s
in
ter
m
s
o
f
p
r
ese
n
t
ab
le
p
ac
k
ag
in
g
i
n
T
ab
le
7
.
I
n
ad
d
itio
n
,
th
e
c
u
s
to
m
er
s
d
o
n
o
t sati
s
f
y
ab
o
u
t
th
e
p
r
o
d
u
ct
p
ac
k
ag
e
w
h
e
n
u
s
i
n
g
.
T
h
e
cu
r
r
en
t p
ac
k
a
g
e
ca
n
o
n
l
y
m
ee
t
8
5
.
7
%
o
f
th
e
ex
p
ec
tatio
n
s
f
r
o
m
th
e
cu
s
to
m
er
s
.
I
t
ca
n
b
e
ea
s
il
y
f
o
u
n
d
th
at
th
e
cu
t
-
ed
g
e
f
o
r
tear
in
g
t
h
e
s
ac
h
e
ts
is
s
m
all
a
n
d
h
ar
d
ly
r
ec
o
g
n
ized
.
T
h
er
e
a
r
e
also
s
o
m
e
s
ac
h
et
s
th
at
d
o
n
o
t
h
av
e
th
e
c
u
t
-
ed
g
e
Evaluation Warning : The document was created with Spire.PDF for Python.
IJ
AA
S
I
SS
N:
2252
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8814
Th
e
E
mp
ir
ica
l A
n
a
lysi
s
to
E
n
h
a
n
ce
Ta
iw
a
n
ese
S
a
tis
fa
ctio
n
…
(
Th
i Nh
a
m
Le
)
281
o
n
;
t
h
er
ef
o
r
e,
c
u
s
to
m
er
s
f
i
n
d
it
i
n
co
n
v
e
n
ien
t
to
tear
t
h
e
s
ac
h
et
s
to
m
a
k
e
t
h
e
co
f
f
ee
.
I
t
is
n
o
w
s
tr
o
n
g
l
y
s
u
g
g
e
s
ted
t
h
at
t
h
e
c
u
t
-
ed
g
e
o
n
ea
ch
s
ac
h
et
s
h
o
u
ld
b
e
in
V
-
s
h
ap
e
an
d
th
e
m
ac
h
i
n
es d
o
in
g
t
h
e
cu
t
-
ed
g
e
o
n
ea
ch
s
ac
h
et
ar
e
to
b
e
w
ell
m
o
n
i
to
r
ed
an
d
co
n
tr
o
lled
s
o
th
at
ev
er
y
s
ac
h
et
h
as a
g
o
o
d
cu
t
-
ed
g
e.
Mo
r
eo
v
er
,
I
n
o
r
d
e
r
to
ac
ce
le
r
ate
Vietn
a
m
co
f
f
ee
’
s
d
ev
elo
p
m
e
n
t,
it
i
s
n
ec
e
s
s
ar
y
to
o
f
f
er
s
p
ec
ial
p
r
o
m
o
tio
n
p
r
o
g
r
a
m
s
b
y
o
f
f
e
r
r
in
g
s
o
m
e
s
m
all
g
i
f
t
s
to
r
e
g
u
lar
cu
s
to
m
er
s
o
n
s
p
ec
ial
o
cc
asio
n
s
s
u
c
h
a
s
:
Natio
n
al
I
n
d
ep
en
d
en
ce
Da
y
o
f
T
ai
w
an
,
Mid
-
au
t
u
m
n
f
es
tiv
a
l,
L
u
n
ar
Ne
w
Yea
r
,
etc…
ar
e
ef
f
ec
ti
v
e
w
a
y
s
to
i
m
p
r
o
v
e
t
h
eir
s
at
is
f
a
ctio
n
an
d
lo
y
alt
y
to
t
h
e
p
r
o
d
u
cts
a
n
d
/o
r
s
er
v
ices.
th
e
s
ales
an
d
m
ar
k
etin
g
d
ep
ar
t
m
e
n
t
o
f
Vietn
a
m
co
f
f
ee
co
m
p
a
n
ies
s
h
o
u
ld
cr
ea
te
p
r
o
p
er
m
ar
k
eti
n
g
ca
m
p
aig
n
s
,
s
elec
t
p
r
o
p
er
ad
v
er
tis
e
m
e
n
t
ch
a
n
n
els
in
T
ai
w
an
to
m
a
k
e
t
h
e
co
f
f
ee
co
n
s
u
m
er
s
i
n
T
ai
w
an
i
n
o
r
d
er
to
b
e
aw
ar
e
o
f
t
h
e
p
r
esen
c
e
o
f
a
g
o
o
d
co
f
f
ee
f
r
o
m
Viet
n
a
m
.
I
n
T
aiw
a
n
,
th
e
r
e
ar
e
d
if
f
er
e
n
t
ch
ai
n
s
o
f
s
u
p
e
r
m
ar
k
et
s
,
s
u
c
h
as
Fa
m
il
y
Ma
r
ts
,
Sev
e
n
E
lev
e
n
t
h
,
C
ar
r
ef
o
u
r
,
etc.
,
w
h
ich
ar
e
ex
tr
e
m
e
l
y
g
o
o
d
ch
an
n
el
s
to
lau
n
ch
t
h
e
ca
m
p
ai
g
n
s
b
esid
es
th
e
o
f
f
icia
l
ad
v
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ab
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.
T
h
r
ee
Facto
r
s
A
f
f
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h
e
O
v
er
all
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6
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i
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r
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p
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3
.
2
.
So
lutio
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o
r
enha
ncing
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s
a
t
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f
a
ct
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n lev
el
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n F
3
B
ased
o
n
T
ab
le
2
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d
T
a
b
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5
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lear
l
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ati
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m
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ce
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5
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7
%,
w
h
i
ch
is
co
n
s
id
er
ed
a
s
er
io
u
s
p
r
o
b
le
m
to
Vietn
a
m
c
o
f
f
ee
i
n
d
u
s
tr
y
i
n
th
is
m
ar
k
et.
T
ab
le
6
in
d
icate
s
th
at
s
p
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ial
s
m
el
l
an
d
f
la
v
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e
i
m
p
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r
tan
t
f
ac
to
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s
in
attr
ac
ti
n
g
n
o
t
o
n
l
y
th
e
co
f
f
ee
u
s
er
s
b
u
t
also
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th
er
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w
h
o
m
a
y
h
a
v
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’
t
tr
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co
f
f
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e
o
r
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r
r
en
tl
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ca
n
n
o
t
u
s
e
co
f
f
ee
d
u
e
to
th
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h
ea
lt
h
p
r
o
b
lem
s
.
C
o
f
f
ee
s
m
ell
s
h
o
u
ld
b
e
p
ar
ticu
lar
ly
r
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o
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n
izab
le
f
r
ag
r
a
n
t
an
d
d
is
t
in
g
u
is
h
ab
le
w
i
th
t
h
e
o
th
e
r
p
r
o
d
u
cts.
T
h
e
m
o
s
t
r
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m
ar
k
ab
le
v
alu
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f
th
e
co
f
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m
ell
an
d
f
la
v
o
r
is
th
at
t
h
e
y
g
i
v
e
u
s
er
s
aler
t
n
es
s
,
an
d
eu
p
h
o
r
ia.
Ho
w
ev
er
,
V
ietn
a
m
co
f
f
ee
co
m
p
a
n
ies
ca
n
n
o
t
o
f
f
er
a
b
etter
f
la
v
o
r
th
a
n
i
ts
co
m
p
e
tito
r
s
c
u
r
r
en
tl
y
ex
is
t
in
g
in
T
ai
w
a
n
,
w
h
ich
m
a
k
es
t
h
e
m
e
x
tr
e
m
el
y
d
is
-
s
atis
f
i
ed
.
T
h
er
ef
o
r
e,
co
f
f
ee
co
m
p
an
i
es
s
h
o
u
ld
i
m
p
r
o
v
e
its
u
n
iq
u
e
s
m
e
ll
an
d
f
lav
o
r
w
h
ich
r
eq
u
ir
es a
s
p
ec
ial
e
f
f
o
r
t i
n
r
esear
ch
in
g
a
n
d
d
ev
elo
p
m
en
t.
As
a
r
esu
lt,
cu
s
to
m
er
s
ar
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als
o
d
is
-
s
atis
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ied
w
it
h
T
r
u
n
g
N
g
u
y
e
n
co
f
f
ee
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ter
m
o
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ex
p
ir
y
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ate.
T
o
s
o
lv
e
th
is
p
r
o
b
lem
,
Viet
n
a
m
co
f
f
ee
co
m
p
a
n
ies
s
h
o
u
ld
ca
r
ef
u
ll
y
d
is
c
u
s
s
w
it
h
th
e
Ta
i
w
a
n
ag
en
t
s
n
o
t
s
elli
n
g
p
r
o
d
u
cts
th
at
w
il
l
b
e
ex
p
ir
ed
w
it
h
i
n
t
h
e
n
e
x
t
t
w
o
m
o
n
t
h
s
.
T
o
d
o
th
is
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th
e
y
s
h
o
u
ld
s
u
p
p
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ag
en
t
s
b
y
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lacin
g
th
e
o
ld
p
r
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d
u
cts
w
it
h
t
h
e
n
e
w
o
n
es.
W
h
en
th
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cu
s
to
m
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ar
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h
ap
p
y
w
i
th
t
h
e
p
r
o
d
u
cts
a
n
d
g
et
u
s
ed
to
Vietn
a
m
co
f
f
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tast
e
,
t
h
e
s
a
les
w
ill b
e
b
o
o
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ted
u
p
s
o
th
er
e
w
o
u
ld
b
e
n
o
s
to
ck
r
e
m
ai
n
ed
.
3
.
3
.
So
lutio
ns
t
o
M
ee
t
Cus
t
o
m
er
’
s
ex
pect
a
t
io
ns
.
B
ased
o
n
an
al
y
s
i
s
r
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u
lt
s
i
n
p
r
ev
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s
s
ec
to
r
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th
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ar
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s
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m
p
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tan
t
d
eter
m
in
a
n
t
s
o
f
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m
ak
in
g
.
Am
o
n
g
t
h
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s
ix
d
et
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m
in
a
n
t
s
,
T
a
b
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2
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4
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6
c
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m
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t.
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h
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m
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th
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cu
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m
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p
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th
e
m
o
s
t
atte
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s
m
ell,
s
p
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f
lav
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r
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co
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f
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co
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n
tr
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s
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ex
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an
d
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t
w
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in
a
p
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n
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m
c
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f
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co
m
p
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n
ies
s
h
o
u
ld
tak
e
th
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m
en
t
s
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g
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T
h
e
co
f
f
ee
in
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u
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e
r
ef
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e
m
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r
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en
tl
y
s
at
is
f
ied
w
it
h
th
eir
p
r
o
d
u
cts
o
n
it
s
s
er
v
ices.
Fu
r
t
h
er
m
o
r
e,
th
er
e
ar
e
s
i
x
m
ain
d
eter
m
i
n
a
n
ts
o
f
b
u
y
i
n
g
a
f
av
o
r
ite
co
f
f
ee
o
f
p
eo
p
le
ar
e
f
o
u
n
d
i
n
t
h
i
s
s
t
u
d
y
.
I
n
t
h
is
s
t
u
d
y
,
T
r
u
n
g
N
g
u
y
e
n
C
o
m
p
a
n
y
an
d
o
t
h
er
Viet
n
a
m
co
f
f
ee
b
r
an
d
s
ar
e
n
o
w
h
av
i
n
g
s
o
m
e
ce
r
tai
n
p
r
o
b
le
m
s
to
b
e
s
o
l
v
ed
i
n
ter
m
s
o
f
lan
g
u
a
g
e
p
r
in
ted
o
n
t
h
e
p
ac
k
a
g
e,
ea
s
e
o
f
tear
in
g
th
e
p
ac
k
a
g
e,
an
d
p
r
o
m
o
tio
n
p
r
o
g
r
a
m
s
o
f
f
er
ed
b
y
V
ietn
a
m
co
f
f
ee
b
r
an
d
s
,
t
h
e
s
m
e
ll
a
f
ter
m
ak
in
g
t
h
e
co
f
f
ee
,
th
e
f
lav
o
r
,
co
f
f
ee
co
n
ce
n
tr
atio
n
s
,
n
et
w
ei
g
h
t
a
n
d
ex
p
ir
y
t
i
m
e.
T
h
o
s
e
p
r
o
b
lem
s
ar
e
to
b
e
s
er
io
u
s
l
y
co
n
s
id
er
ed
an
d
s
ettled
to
en
h
an
ce
t
h
e
cu
s
t
o
m
er
s
atis
f
ac
tio
n
le
v
el
.
I
n
o
u
r
l
i
m
itatio
n
s
o
f
t
h
is
r
ese
ar
ch
,
th
e
p
ap
er
ai
m
s
to
h
elp
Vietn
a
m
co
f
f
ee
co
m
p
a
n
ies
s
o
lv
e
t
h
ese
p
r
o
b
lem
s
,
s
o
m
e
p
o
s
s
ib
le
s
o
l
u
tio
n
s
w
er
e
s
u
g
g
e
s
ted
as
v
alu
e
d
in
s
i
g
h
ts
to
m
ar
k
et
r
esear
c
h
er
s
.
T
h
ese
s
o
lu
tio
n
s
ar
e
co
n
s
id
er
ed
as
i
m
m
ed
iate
ac
tio
n
s
t
h
at
ca
n
i
m
p
r
o
v
e
t
h
e
cu
s
to
m
er
s
c
u
r
r
en
t
s
atis
f
ac
tio
n
lev
el
o
f
Viet
n
a
m
co
f
f
ee
i
n
T
ai
w
a
n
.
Ho
w
e
v
er
,
t
h
e
co
m
p
letel
y
i
n
ter
g
r
ated
p
er
f
o
r
m
a
n
ce
n
ee
d
s
a
d
etailed
r
ee
v
alu
atio
n
in
ter
m
o
f
d
if
f
er
e
n
t
m
ar
k
e
ts
t
h
at
ca
n
b
e
ap
p
lied
to
an
d
m
o
r
e
in
p
u
t
d
at
a
f
r
o
m
r
e
s
p
o
n
d
en
t
s
.
T
h
o
s
e
d
is
ad
v
a
n
tag
e
s
w
il
l
b
e
i
m
p
r
o
v
ed
b
y
th
e
f
u
tu
r
e
d
ir
ec
ti
o
n
s
an
d
r
esear
ch
e
s
.
RE
F
E
R
E
NC
E
S
[
1
]
L
u
o
n
g
QV
,
T
a
u
e
r
LW
.
A
Re
a
l
Op
ti
o
n
s
A
n
a
l
y
sis
o
f
Co
ff
e
e
P
lan
ti
n
g
in
Vie
tn
a
m
.
Ag
ricu
lt
u
ra
l
Eco
n
o
m
ics
.
2
0
0
6
;
3
5
(
1
):
4
9
-
5
9
.
[
2
]
Da
n
g
T
H,
S
h
iv
e
l
y
G
.
Co
ff
e
e
B
o
o
m
,
Co
f
fe
e
Bu
st
a
n
d
S
m
a
ll
h
o
l
d
e
r
Re
sp
o
n
se
in
V
iet
n
a
m
’s
Ce
n
tral
Hig
h
lan
d
s
.
Re
v
ie
w
o
f
D
e
v
e
lo
p
m
e
n
t
Eco
n
o
m
ics
.
2
0
0
8
;
1
2
(
2
):
3
1
2
-
3
2
6
.
[
3
]
Ng
u
y
e
n
H,
W
a
rd
M
.
Vie
tn
a
m
Co
ff
e
e
A
n
n
u
a
l.
USDA
G
lo
b
a
l
A
g
ric
u
lt
u
ra
l
I
n
f
o
rm
a
ti
o
n
Ne
tw
o
rk
.
V
M
5
0
3
0
.
2
0
1
5
.
[
4
]
T
ra
n
TT
.
V
ietn
a
m
’s Co
ff
e
e
In
d
u
s
try
.
Ip
so
s Ag
ricu
lt
u
ra
l
Re
se
a
rc
h
a
n
d
C
o
n
s
u
lt
in
g
.
2
0
1
3
.
[
5
]
M
in
istry
o
f
Ag
ricu
lt
u
ra
l
a
n
d
Ru
ra
l
De
v
e
lo
p
m
e
n
t
(M
A
RD).
Av
a
il
a
b
le o
n
li
n
e
:
h
tt
p
:/
/w
ww
.
m
a
rd
.
g
o
v
.
v
n
/
.
A
c
c
e
ss
e
d
o
n
M
a
rc
h
1
9
th
2
0
1
6
.
[
6
]
Do
TT
H.
T
h
e
In
f
lu
e
n
c
e
o
f
Br
a
n
d
Aw
a
r
e
n
e
ss
o
n
th
e
Re
latio
n
sh
ip
B
e
tw
e
e
n
P
e
rc
e
iv
e
d
Qu
a
li
ty
a
n
d
Cu
sto
m
e
r
S
a
ti
sf
a
c
ti
o
n
o
f
G
7
Co
ff
e
e
in
Vie
tn
a
m
.
M
a
ste
r
T
h
e
sis.
M
e
ih
o
Un
iv
e
rsit
y
,
T
a
i
wa
n
.
2
0
1
0
.
[
7
]
Do
a
n
T
N.
V
iet
n
a
m
Co
ffe
e
In
d
u
st
ry
.
P
ro
c
e
e
d
in
g
o
f
In
ter
n
a
ti
o
n
a
l
C
o
f
fe
e
Co
n
f
e
re
n
c
e
.
L
o
n
d
o
n
,
UK
.
2
0
0
1
.
[
8
]
Op
p
e
n
h
e
im
,
A
.
N.
Qu
e
stio
n
n
a
ire De
sig
n
,
In
terv
iew
in
g
a
n
d
A
tt
it
u
d
e
M
e
a
su
re
m
e
n
t.
L
o
n
d
o
n
:
P
in
ter
P
u
b
li
s
h
e
rs.1
9
9
2
[
9
]
F
o
w
ler,
F
.
Im
p
ro
v
in
g
su
rv
e
y
q
u
e
stio
n
s.
De
sig
n
a
n
d
e
v
a
lu
a
ti
o
n
.
L
o
n
d
o
n
:
S
a
g
e
.
1
9
9
5
.
[
1
0
]
S
c
h
w
a
rz
N,
Hip
p
ler
H.
Re
sp
o
n
se
A
lt
e
rn
a
ti
v
e
s:
th
e
I
m
p
a
c
t
o
f
th
e
ir
Ch
o
ice
a
n
d
P
re
se
n
tati
o
n
Or
d
e
r.
In
:
Biem
e
r
P
P
,
G
ro
v
e
s RM
,
Ly
b
e
rg
L
E.
Ed
it
o
rs.
M
e
a
su
re
m
e
n
t
Err
o
rs i
n
S
u
rv
e
y
s.
Ne
w
Yo
rk
:
W
il
e
y
-
In
ters
c
ien
c
e
.
1
9
9
1
:4
1
-
5
6
.
[
1
1
]
S
c
h
w
a
rz
N,
Hip
p
ler
H,
De
u
tsc
h
B,
S
trac
k
F
.
Re
sp
o
n
se
S
c
a
les
:
Eff
e
c
ts
o
f
C
a
teg
o
r
y
R
a
n
g
e
o
n
Re
p
o
rted
Be
h
a
v
io
r
a
n
d
Co
m
p
a
ra
ti
v
e
Ju
d
g
m
e
n
ts.
P
u
b
li
c
Op
in
i
o
n
Qu
a
rterly
.
1
9
8
5
;
4
9
(
3
):
3
8
8
-
9
5
.
[
1
2
]
Bo
d
u
sz
e
k
D.
Ex
p
l
o
ra
to
ry
F
a
c
to
r
A
n
a
l
y
si
s in
S
P
S
S
.
U
n
iv
e
rsity
o
f
Hu
d
d
e
rsf
ield
.
[
1
3
]
W
il
li
a
m
s
A
P
e
t
a
ll
.
F
o
re
st
Re
s
p
o
n
se
s
to
In
c
re
a
sin
g
A
rid
it
y
a
n
d
W
a
r
m
th
in
th
e
S
o
u
th
w
e
ste
rn
Un
it
e
d
S
tate
s
.
P
r
o
c
e
e
d
in
g
s o
f
th
e
Na
ti
o
n
a
l
A
c
a
d
e
m
y
o
f
S
c
ien
c
e
s
.
USA
.
2
0
1
0
:
2
1
2
8
9
–
2
1
2
9
4
.
[
1
4
]
Ka
ise
r
HF.
T
h
e
A
p
p
li
c
a
ti
o
n
o
f
El
e
c
tro
n
ic
Co
m
p
u
ters
to
F
a
c
to
rs
A
n
a
l
y
sis.
Ed
u
c
a
ti
o
n
a
l
a
n
d
P
sy
c
h
o
lo
g
ica
l
M
e
a
su
re
m
e
n
t.
1
9
6
0
;
2
0
:
1
4
1
-
1
5
1
.
[
1
5
]
Ka
ise
r
HF.
A
n
In
d
e
x
o
f
F
a
c
to
rial
S
im
p
li
c
it
y
.
P
sy
c
h
o
m
e
tri
k
a
.
1
9
7
4
;
3
9
:
3
1
-
3
6
.
[
1
6
]
Sc
h
m
it
t
N.
Us
e
s an
d
A
b
u
se
s o
f
Co
e
ff
icie
n
t
A
lp
h
a
.
P
sy
c
h
o
lo
g
ica
l
As
se
ss
m
e
n
t.
1
9
9
6
;
8
:
3
5
0
-
3
5
3
.
[
1
7
]
Ha
ir
JJ
F
,
Blac
k
W
C,
Ba
b
in
BJ,
A
n
d
e
rso
n
RE.
M
u
lt
iv
a
riate
Da
ta
A
n
a
l
y
si
s:
a
G
lo
b
a
l
P
e
rsp
e
c
ti
v
e
.
S
e
v
e
n
th
Ed
it
io
n
.
L
o
n
d
o
n
:
P
e
a
rso
n
.
2
0
0
9
.
[
1
8
]
S
a
rg
e
n
t
DJ
,
Ho
d
g
e
s
JS.
S
m
o
o
th
e
d
A
NO
V
A
w
it
h
A
p
p
li
c
a
ti
o
n
to
S
u
b
g
ro
u
p
A
n
a
ly
sis.
Tec
h
n
ica
l
R
e
p
o
rt.
De
p
a
rtm
e
n
t
o
f
Bio
sta
ti
stics
,
Un
iv
e
rsity
o
f
M
i
n
n
e
so
ta.
[
1
9
]
Ro
b
i
n
so
n
G
K.
T
h
a
t
BL
UP
is
G
o
o
d
T
h
in
g
:
t
h
e
Esti
m
a
ti
o
n
o
f
Ra
n
d
o
m
E
ff
e
c
ts.
S
tatisti
c
a
l
S
c
ien
c
e
.
1
9
9
1
;
6
:
1
5
-
51.
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