Texas Instruments TI-Nspire Reference Guide

78 TI-Nspire™ Reference Guide
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 97.)
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” on page 131.
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 in the modified X List actually used in the regression based on restrictions of Freq,
Category List, and Include Categories
stat.YReg List of data points in the 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 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
97.)
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” on page 131.

Texas Instruments TI-Nspire Specifications

General

Type	Display
Form factor	Pocket
Product color	Blue, White
Display resolution	320 x 240 pixels
Display size (HxV) (imperial)	0 \
Compatible operating systems	Windows Vista/XP Mac OS X 10.4/10.5
Battery type	AAA
Number of batteries supported	4

Weight and Dimensions

Dimensions (WxDxH)	100 x 198.3 x 28.7 mm