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Cubic Regression
y
Model Formula:
a
:
cubic regression coefficient
b
:
quadratic regression coefficient
c
:
linear regression coefficient
d
:
regression constant term (
r
2
:
coefficient of determination
MSe
: mean square error
1
Σ
• MSe =
n – 4
i =1
Quartic Regression
Model Formula:
a
:
quartic regression coefficient
b
:
cubic regression coefficient
c
:
quadratic regression coefficient
d
:
linear regression coefficient
e
:
regression constant term (
r
2
:
coefficient of determination
MSe
: mean square error
1
• MSe =
n – 5
7-5-8
Graphing Paired-Variable Statistical Data
a
x
b
x
c
x
d
=
·
3
+
·
2
+
·
+
y
-intercept)
n
3
2
(y
– (a·x
+ b·x
+ c·x
i
i
i
y
a
x
4
b
x
3
c
x
2
=
·
+
·
+
·
+
y
-intercept)
n
Σ
4
3
(y
– (a·x
+ b·x
+ c·x
i
i
i
i =1
20050501
2
+d ))
i
d
x
e
·
+
2
2
+ d·x
+ e))
i
i
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