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19990401
kk
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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
4(CALC)e(Quad)
6(DRAW)
Quadratic regression
Model formula ..... y = ax
2
+ bx + c
a .............
regression second coefficient
b ............. regression first coefficient
c ............. regression constant term (intercept)
Cubic regression
Model formula ..... y = ax
3
+ bx
2
+ cx + d
a .............
regression third coefficient
b ............. regression second coefficient
c ............. regression first coefficient
d ............. regression constant term (intercept)
Quartic regression
Model formula ..... y = ax
4
+ bx
3
+ cx
2
+ dx + e
a .............
regression fourth coefficient
b ............. regression third coefficient
c ............. regression second coefficient
d ............. regression first coefficient
e ............. regression constant term (intercept)
6-3-7
Calculating and Graphing Paired-Variable Statistical Data
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