Casio fx-9860G SD User Manual page 293

Calculating and Graphing Paired-Variable Statistical Data
k k k k 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 .............
b .............
c .............
r
2 ............ coefficient of determination
MSe
........ mean square error
Cubic regression
Model formula .....
a .............
b .............
c .............
d .............
r
2 ............ coefficient of determination
MSe
........ mean square error
Quartic regression
Model formula .....
a .............
b .............
c .............
d .............
e .............
r
2 ............ coefficient of determination
MSe
........ mean square error
6-3-7
2
y ax bx
= + +
regression second coefficient
regression first coefficient
regression constant term (
3 2
y ax bx
= + +
regression third coefficient
regression second coefficient
regression first coefficient
regression constant term (
4 3
y ax bx
= + +
regression fourth coefficient
regression third coefficient
regression second coefficient
regression first coefficient
regression constant term (
c
y
-intercept)
cx d
+
y
-intercept)
2
cx dx e
+ +
y
-intercept)
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