ExpReg
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ExpReg X, Y [, [Freq] [, Category,
Include]]
Computes the exponential regression y = a•
(b)
x
on lists X and Y with frequency Freq. A
summary of results is stored in the
stat.results variable. (See page 172.)
All the lists must have equal dimension
except for Include.
X and Y are lists of independent and
dependent variables.
Freq is an optional list of frequency values.
Each element in Freq specifies the
frequency of occurrence for each
corresponding X and Y data point. The
default value is 1. All elements must be
integers ≥ 0.
Category is a list of category codes for the
corresponding X and Y data.
Include is a list of one or more of the
category codes. Only those data items
whose category code is included in this list
are included in the calculation.
For information on the effect of empty
elements in a list, see “Empty (Void)
Elements,” page 232.
Output
variable
Description
stat.RegEqn
Regression equation: a•(b)
x
stat.a, stat.b Regression coefficients
stat.r
2
Coefficientof linear determination for transformeddata
stat.r Correlation coefficient for transformed data (x, ln(y))
stat.Resid Residuals associated with the exponential model
stat.ResidTrans Residuals associated with linear fitof transformed data
stat.XReg
Listof data points in the modifiedX List actually used in the regression based on
restrictions of Freq, Category List, and Include Categories
Alphabetical Listing 69
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