Casio CFX9850GBPLUS User Manual page 293

Calculating and Graphing Paired-Variable Statistical Data
k Quadratic/Cubic/Quartic Regression Graph
A quadratic/cubic/quartic regression graph represents connection of the data points of a
scatter diagram. It uses the method of least squares to draw a curve that passes close to
as many data points as possible. The formula that represents this is quadratic/cubic/quartic
regression.
Ex. Quadratic regression
1 (CALC)4 (X^2)
6 (DRAW)
Quadratic regression
Model formula .......
a
...............regression second coeffi cient
b
...............regression fi rst coeffi cient
c
...............regression constant term (
r
2 .............coeffi cient of determination
MSe
........mean square error
Cubic regression
Model formula .......
a
...............regression third coeffi cient
b
...............regression second coeffi cient
c
...............regression fi rst coeffi cient
d
...............regression constant term (
r
2
.............coeffi cient of determination
MSe
........mean square error
Quartic regression
Model formula .......
a
...............regression fourth coeffi cient
b
...............regression third coeffi cient
c
...............regression second coeffi cient
d
...............regression fi rst coeffi cient
e
...............regression constant term (
r
2 .............coeffi cient of determination
MSe
........mean square error
6-3-7
y ax bx c
= 2 + +
y
-intercept)
y ax bx cx d
= 3 + 2 + +
y
-intercept)
y ax bx cx dx
4 3 2
= + + +
y
-intercept)
20070201
e
+