299
Quartic regression
a ...... Quartic regression coefficient
b ...... Cubic regression coefficient
c ...... Quadratic regression coefficient
d ...... Linear regression coefficient
e ...... Regression constant term (intercept)
kk
kk
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
kk
kk
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
bx
, 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)
123456
123456
Calculating and Graphing Paired-Variable Statistical Data 18 - 4
P.290
P.290
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