Texas-instruments TI-73 EXPLORER User Manual download pdf (Page 152)

100

101

146

Chapter 7: Statistical Analyses

7307ENG.DOC CH 7, Statistical Analyses, English Julie Hewlett Revised: 07/29/98 12:07 PM Printed: 05/19/99

9:00 AM Page 146 of 22

6. View the equation stored to

, if desired.

ExpReg ExpReg

7 7

ExpReg

(exponential regression) fits the model equation

y=ab

to the data using a least-squares fit and transformed values x

and ln(y). It displays values for

and

; when

DiagnosticOn

set, it also displays values for

(coefficient of determination)

and

(correlation coefficient). The

DiagnosticOn

command is in

the

CATALOG

(- |). You can execute

ExpReg

from the

Graph screen, the Home screen, or the Program editor.

From the Home screen or the Program editor,

ExpReg

accepts

four optional arguments. Enter up to two list names, XList and

YList; a frequency list, freq: and an equation variable, Yn. freq

is the frequency of occurrence for each corresponding data

point in XList and YList. If freq is omitted, all values are used

once. If XList and YList are not specified, the default list

names are

and

. To access

variables, press - }

ExpReg

[XList,YList,freq,Yn]

Graph a scatter plot for

and

, where

={1,3,4,5,5,7,8,9}

and

={1,4,2,3,4,6,7,9}

, and use

ExpReg

to draw the exponential

regression curve through the points.

1. Set Decimal Notation mode

, if desired.

.#"""b

, and

may vary.

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