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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)
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.
[1(Log)
4(DRAW)
The following are the meanings of the above parameters.
a ...... Regression constant term
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 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)
P. 106
1234
1234
P. 106
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