Texas Instruments TI-73 用户手册

     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   -

 

  v

 

  !

 

 (exponential regression) fits the model equation 

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

and ln(y). It displays values for 

 and 

; when 

 is

set, it also displays values for 

 (coefficient of determination)

and 

(correlation coefficient). The 

 command is in

the 

 (- |). You can execute 

 from the

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

 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 - } 

.

[XList,YList,freq,Yn]

Graph a scatter plot for 

 and 

, where 

 and

, and use 

 to draw the exponential

regression curve through the points.

1. Set Decimal Notation mode

to 

, if desired.

. # " " " b

³

, Y

, and Y

may vary.