Texas Instruments TI-86 - Manual (Page 325)

Chapter 20: A to Z Function and Instruction Reference
313
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 313 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 313 of 118
LgstR
STAT CALC menu
Built-in equation variables
such as y1, r1, and xt1 are
case-sensitive. Do not use
Y1, R1, and XT1.
LgstR returns a tolMet
value that indicates if the
result meets the TI
- 86’s
internal tolerance.
• If tolMet=1, the result is
within the internal
tolerance.
• If tolmet=0, the result is
outside the internal
tolerance, although it
may be useful for general
purposes.
LgstR [ iterations ,] xList , yList , frequencyList , equationVariable
Fits a logistic regression model (y=a/(1+be cx )+d) to real
data pairs in xList and yList 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 . The equation’s
coefficients always are stored as a list to built-in
variable
PRegC .
The number of iterations is optional. If omitted, 64 is
the default. A large number of iterations may produce
more accurate results but may require longer
calculation times. A smaller number may produce less
accurate results but with shorter calculation times.
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 .
In Func graphing mode:
{1,2,3,4,5,6}¶L1 b
{1 2 3 4 5 6}
{1,1.3,2.5,3.5,4.5,4.8}¶L2 b
{1 1.3 2.5 3.5 4.5 4…
LgstR L1,L2,y1 b
Plot1(1,L1,L2) b Done
ZData b
LgstR [ iterations ,] xList , yList , equationVariable
Uses frequencies of 1.
LgstR [ iterations ,] xList , yList , frequencyList
Stores the regression equation to RegEq only.
LgstR [ iterations ,] xList , yList
Uses frequencies of 1, and stores the regression
equation to
RegEq only.