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stat.RegEqn
Regression equation: a•x
2
+b•x+c
stat.a,
stat.b, stat.c
Regression coefficients
stat.R
2
Coefficientof determination
stat.Resid Residuals from the regression
stat.XReg
Listof data points in the modifiedX List actually used in the regression based on
restrictions of Freq, Category List, and Include Categories
stat.YReg
Listof data points in the modifiedY List actually used inthe regression basedon
restrictions of Freq, Category List, and Include Categories
stat.FreqReg
Listof frequencies corresponding to stat.XReg and stat.YReg
QuartReg
Catalog >
QuartReg X,Y[, Freq][, Category, Include]]
Computes the quartic polynomial regression
y = a•x
4
+b•x
3
+c• x
2
+d•x+e on lists X and Y
with frequency Freq. A summary of results
is stored in the stat.results variable. (See
page 145.)
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 numeric or string
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 196.
Alphabetical Listing 117
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