Casio ALGEBRA FX 2.0 Statistical Graphs and Calculations Manuel d'utilisateur télécharger pdf (Page 16)

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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

+ bx + c

a .............

regression second coefficient

b ............. regression first coefficient

c ............. regression constant term (intercept)

Cubic regression

Model formula ..... y = ax

+ bx

+ 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

+ bx

+ cx

+ 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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Casio ALGEBRA FX 2.0 Statistical Graphs and Calculations Manuel d'utilisateur Page 16