Texas Instruments TI-86 - Manual (Page 305)

Chapter 20: A to Z Function and Instruction Reference
293
20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 293 of 118 20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 293 of 118
ExpR
STAT CALC menu
Built-in equation variables
such as y1, r1, and xt1 are
case-sensitive. Do not use
Y1, R1, and XT1.
ExpR xList , yList , frequencyList , equationVariable
Fits an exponential regression model (y=ab x ) to real
data pairs in xList and yList ( y values must be > 0) and
frequencies in frequencyList. The regression equation is
stored to equationVariable, which must be a built-in
equation variable such as
y1 , r1 , and xt1 .
Values used for xList, yList, and frequencyList are
stored automatically to built-in variables
xStat , yStat ,
and fStat , respectively. The regression equation is
stored also to built-in equation variable RegEq .
ExpR xList , yList , equationVariable
Uses frequencies of 1.
ExpR xList , yList , frequencyList
Stores the regression equation to RegEq only.
ExpR xList , yList
Uses frequencies of 1, and stores the regression
equation to
RegEq only.
In Func graphing mode:
{1,2,3,4,5}¶L1 b
{1 2 3 4 5}
{1,20,55,230,742}¶L2 b
{1 20 55 230 742}
ExpR L1,L2,y1 b
Plot1(1,L1,L2) b Done
ZData b
ExpR equationVariable
Uses xStat , yStat , and fStat for xList, yList, and
frequencyList , respectively. These built-in variables
must contain valid data of the same dimension;
otherwise, an error occurs. The regression equation is
stored to equationVariable and
RegEq .