Casio fx-7400G PLUS Statistical Graphs and Calculations Instrukcja Użytkownika Pobierz pdf (Strona 22)

116

Chapter 7 Statistical Graphs and Calculations

The following are the meanings of the above parameters.

a ...... Regression second coefficient

b ...... Regression first coefficient

c ...... Regression constant term (y-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.

[1(Log)

4(DRAW)

The following are the meanings of the above parameters.

a ...... Regression constant term

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 log

y = loga + bx. Next, if we say Y = logy, and A = loga,

the formula corresponds to linear regression formula Y = A +

bx.

[2(Exp)

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Casio fx-7400G PLUS Statistical Graphs and Calculations Instrukcja Użytkownika Strona 22