Renkforce RF-CA-240 - Page 25

• Logarithmic, Exponential, Power, and Inverse regression
• Use the same key operations as linear regression to recall results for these types of
regression.
• The following shows the regression formulas for each type of regression.
Logarithmic regression
Exponentialregression
Power regression
Inverse regression
• Quadratic regression
• The regression formula for quadratic regression is: y=A+Bx+Cx
2
.
• Example:
Xi yi
Perform quadratic regression to determine the regression
formulatermsforthedatanearby.Next,usetheregression
formula to estimate the values for (estimated value of y)
forxi=16and (estimated value of x) for yi = 20.
29 1.6
50 23.5
74 38.0
103 46.4
118 48.0
In the REG Mode:
RegressionCoefcientA=-35.59856934
RegressionCoefcientB=1.495939413
RegressionCoefcientC=-6.71629667x 10
-3
ywhenxiis16=-13.33291067
x1whenyiis20=47.14556728
x2whenyiis20=175.5872105
(Sata clear)
25