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263
Calculating and Graphing Paired-Variable Statistical Data 18 - 4
kk
kk
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)
12345
6
6(DRAW)
a...... regression constant term (intercept)
b ...... regression coefficient (slope)
r ...... correlation coefficient
r
2
..... coefficient of determination
kk
kk
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
bx
, 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)
12345
6
6(DRAW)
a ...... regression coefficient
b ...... regression constant term
r ...... correlation coefficient
r
2
..... coefficient of determination
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