Casio fx-9750G Statistical Graphs and Calculations Manuel d'utilisateur télécharger pdf (Page 17)

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Quartic regression

a ...... Quartic regression coefficient

b ...... Cubic regression coefficient

c ...... Quadratic regression coefficient

d ...... Linear regression coefficient

e ...... Regression constant term (intercept)

k Logarithmic Regression Graph

Logarithmic regression expresses y as a logarithmic function of x. The standard

logarithmic regression formula is y = a + b × logx, so if we say that X = logx, the

formula corresponds to linear regression formula y = a + bX.

6(g)1(Log)

6(DRAW)

The following are the meanings of the above parameters.

a ...... Regression constant term (intercept)

b ...... Regression coefficient (slope)

r ...... Correlation coefficient

k Exponential Regression Graph

Exponential regression expresses y as a proportion of the exponential function of x.

The standard exponential regression formula is y = a × e

, so if we take the loga-

rithms of both sides we get logy = loga + bx. Next, if we say Y = logy, and a = loga,

the formula corresponds to linear regression formula Y = a + bx.

6(g)2(Exp)

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Calculating and Graphing Paired-Variable Statistical Data 18 - 4

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Casio fx-9750G Statistical Graphs and Calculations Manuel d'utilisateur Page 17