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263

Calculating and Graphing Paired-Variable Statistical Data 18 - 4

k Logarithmic Regression Graph

P. 254 Logarithmic regression expresses y as a logarithmic function of x. The standard

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

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

6(g)1(Log)

1 2 3 4 5

6(DRAW)

a ...... regression constant term

b ...... regression coefficient

r ...... correlation coefficient

..... coefficient of determination

k Exponential Regression Graph

P. 254 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

logarithms of both sides we get Iny = Ina + bx. Next, if we say Y = Iny, and A = Ina,

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

6(g)2(Exp)

1 2 3 4 5

6(DRAW)

a ...... regression coefficient

b ...... regression constant term

r ...... correlation coefficient

..... coefficient of determination

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