Texas Instruments TI-86 - 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 11820ATOZ.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
.