Instruction Manual

Logarithmic, Exponential, Mathematical Power
and Inverse Regression
Use these regression types in the same way that
you use linear regression (see above).
The corresponding regression formulas ore:
Logarithmic regression
y=A+B • Inx
Exponential regression
y=A- e“'*(lny=lnA+Bx)
Mathematical Power
Regression
y= A • X ® (Iny =lnA+B Inx)
Inverse regression
y=A+B.;^
xi
yi
29 1.6
50 23.5
74
38.0
103 46.4
118 48.0
Quadratic Regression
The regression formula for quadratic regression is
y=k+ix+Cx ^
Example: In this example, we perform quadratic
regression on the given doto to
determine the regression formula and
then use the formula to calculate y
(the estimated value of y) when xi =
16 and the x value (the estimated
value of x) when yi= 20.
In regression (REG) mode:
H H (Quad)
[sSi] (Scl) B (Stat clear)
29 Q 1.6[^50Q23.5[^
74 Q 38.0 103 Q 46.4 m
Regression coefficient 118H48.0IM]
A=-35.59856934 H S H H □;] B
Regression coefficient
8=1.495939414 H H H H H B
Regression coefficient
C=-6.71629667X10^" HHHHEB
Estimated value of
y=~l 3.38291067 when xi =
16 isltl islil m
16
Estimated value of XT-
:47.14556728 when yi=20
20HHHHHCOB
28