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u Regression coefficient C
u Regression coefficient A
A = – B
(
)
– C
(
)
n
Σy
n
Σx
n
Σx
2
u Regression coefficient B
B = (S
xy
.
S
x
2
x
2
– S
x
2
y
.
S
xx
2
) ÷ {S
xx
.
S
x
2
x
2
– (S
xx
2
)
2
}
(
Σx
)
2
(
Σx
.
Σx
2
)
C
= S
x
2
y
.
S
xx
– S
xy
.
S
xx
2
Sxx
=
Σx
2
– ,
Sxy
=
Σxy
–
Sxx
2
=
Σx
3
– ,
Sx
2
x
2
=
Σx
4
–
Sx
2
y
=
Σx
2
y
–
n
n
(
Σx
2
)
2
n
n
(
Σx
2
.
Σy
)
n
(
Σx
.
Σy
)
5 Inverse Regression y = A + B
ؒ
1
/x
u Correlation coefficient
r
u Regression coefficient A
A =
n
Σy
–
B
.
Σx
–1
u Regression coefficient B
B =
Sxx
Sxy
r
=
Sxx
=
Σ
(
x
–1
)
2
–
,
Syy
=
Σy
2
–
Sxy
=
Σ
(
x
–1
)
y
–
Sxx
.
Syy
Sxy
n
(
Σx
–1
)
2
n
Σx
–1
.
Σy
n
(
Σy
)
2
6 Quadratic Regression y = A + Bx + Cx
2