Application Guide

142 Alphabetical Listing
QuadReg
Catalog >
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 236.
Output
variable
Description
stat.RegEqn
Regression equation: a•x
2
+b•x+c
stat.a,
stat.b, stat.c
Regression coefficients
stat.R
2
Coefficient of determination
stat.Resid Residuals from the regression
stat.XReg
List of data points inthe modified X List actually usedin the regression based on
restrictions of Freq, Category List, and Include Categories
stat.YReg
List of data points inthe modified Y List actually used in the regression based on
restrictions of Freq, Category List, and Include Categories
stat.FreqReg
List of frequencies corresponding to stat.XReg andstat.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 177.)
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.