Texas Instruments Voyage 200 Guide Book

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App † Calc Menu 85
CubicReg
Description
† (
Calc) Æ 3:Regressions Æ 5:CubicReg
CubicReg (cubic regression) calculates the cubic polynomial regression,
y=a*x^3+b*x^2+c*x+d on lists X and Y.
Inputs
X List, Y List Independent and dependent variable lists.
Store RegEqn to
(optional)
Designated variable for storing the Regression Equation.
Freq
(optional)
The name of the list containing the frequency values for the data in
List.
The default is 1. All elements must be real numbers |0.
Each element in the frequency
(Freq) list is the frequency of occurrence
for each corresponding data point in the input list specified in the
List
field.
Category List
(optional)
List that can be used to categorize the entries of the list specified in the
List field.
Include Categories
(optional)
If you input a Category
List
, you can use this item to limit the calculation
to specified category values. For example, if you specify {1,4}, the
calculation uses only data points with a category value of 1 or 4.
For more information on using these inputs, see the example Studying Statistics:
Filtering Data by Categories in the Applications module.
Outputs
Outputs Stored to Description
a,b,c,d a,b,c,d Regression coefficients.
R
2
rsq Coefficient of determination.
resid* resid Residuals of the curves fit = y - (a*x^3+b*x^2+c*x+d).
RegEqn regeqn
†
Regression equation: a*x^3+b*x^2+c*x+d.
xout
†
List of data points in the modified X List actually used in the regression
based on restrictions of
Freq, Category List, and Include Categories.
yout
†
List of data points in the modified Y List actually used in the regression
based on restrictions of
Freq, Category List, and Include Categories.
freqout
†
List of frequencies corresponding to xout and yout.
* Output variable is pasted to the end of the list editor when Results -> Editor option is YES, (located
in ƒ (Tools) 9:Format).
†
If RegEqn, Freq, Category List, or Include Categories are used as inputs, these are also outputs.

Texas Instruments Voyage 200 Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Blue
Display resolution	128 x 240 pixels