108
Statistical Graphs and Calculations Chapter 7
[2(Exp)
4(DRAW)
The following are the meanings of the above parameters.
a ...... Regression coefficient
b ...... Regression constant term
r ...... Correlation coefficient
kk
kk
k Power Regression Graph
Exponential regression expresses y as a proportion of the power of x. The standard
power regression formula is y = a $ x
b
, so if we take the logarithms of both sides we
get logy = loga + b $ logx. Next, if we say X = log x, Y = logy, and a = loga, the formula
corresponds to linear regression formula Y = a + bX.
[3(Pwr)
4(DRAW)
P.99
(G-Type)
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