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116 Alphabetical Listing
QR
Catalog >
tolerance is calculated as:
5E−14 •max(dim(Matrix)) •rowNorm
(Matrix)
The QR factorization is computed
numerically using Householder
transformations. The symbolic solution is
computed using Gram-Schmidt. The
columns in qMatName are the orthonormal
basis vectors that span the space defined by
matrix.
QuadReg
Catalog >
QuadReg X,Y[, Freq][, Category, Include]]
Computes the quadratic polynomial
regression y=a•x
2
+b•x+c 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.
Output
variable
Description
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