27
• The corresponding regression formulas are:
Quadratic Regression
• The regression formula for quadratic regression is
y = A+Bx+Cx
2
• Example: In this example, we
perform quadratic regression on the
given data to determine the
regression formula and then use
the formula to calculate (the
estimated value of ) when = 16
and the value (the estimated
value of ) when = 20.
In regression (REG) mode:
(Quad)
(Scl) (Stat clear)
29
1.6 50 23.5
74 38.0 103 46.4
118 48.0
Logarithmic
regression
y = A+B•lnx
Exponential
regression
y = A•e
B
·x
(lny = lnA+Bx)
Mathematical
Power regression
y = A•e
x
(lny = lnA+B lnx)
Inverse regression y = A+B•1/x
29 1.6
50 23.5
74 38.0
103 46.4
118 48.0
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