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S
yy
ii
−=∆
i
y
B&N*#]NWXT^YZ
S
y
B&N*1P"/&(!8
U O1%:&@( +
O/;(+*78"1%:&@("!/
SSS
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=


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n
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n
n
n
n
n
i
i
δ
δ
@* &-561''7A
O/((*8:854*7@1#4'=*
>

́
p K15KKT6 Trang 4
Nguyên ly
́
Thống kê kinh tế vơ
́
i SPSS ThS. Nguyê
̃
n Thi
̣
Tiến
U (*8 3"!/BO/#4:!8[&N*#]NM
#]$)&N*#]N"Q )A
S


=
i
i
i
y
y
t
 XT^GY
U (*8 3J(B"/#4:!8[&N*7#]N
M#]$)&N*/!A1P"/&(!8>"/&N*<
S
y
y
T
i
i
=
S
y
B&N*<
U (*8 3+B"/(+78(P8 3"
!/A:8(*8 3+ !(>N
S
S
S
T
S
S
^T




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n
n
n
n
i
n
n
y
y
ttttt
B* &-56'>;C-?
O/((:8&N*7@1N[>=
%&!R:&!"<!R!_
U

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!/$)&N*#]("!/
Saa
S
SS
S
−=
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=
−−

ii
i
i
i
i
ii
i
ta
t
yy
yy
a
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W4-V_Z
U (*%:&J(B"/`(!8["1%:&@(J
($)&N*#]((J
S
SS
S
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ni

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A
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U (*%:&+
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S
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Saa
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p K15KKT6 Trang 5
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́
Thống kê kinh tế vơ
́
i SPSS ThS. Nguyê
̃
n Thi
̣
Tiến
O/8!8P1$2, !(#A"/83

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t
y
B&N*"c4
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→−
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btay
+=

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B J("c4
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t
y
1!"/-1M($)=(#B

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p K15KKT6 Trang 6

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