TI -86 用户手册

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

STAT CALC menu

Built-in equation variables
such as y1, r1, and xt1 are
case-sensitive. Do not use
Y1, R1, and XT1.

 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 [

,]

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

, which must be a built-in equation

variable such as 

, 

, and 

. The equation’s

coefficients always are stored as a list to built-in
variable 

.

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 

, 

,

and 

, respectively. The regression equation is

stored also to built-in equation variable 

.

In 

 graphing mode:

LgstR [

,]

Uses frequencies of 1.

LgstR [

,]

Stores the regression equation to 

 only.

LgstR [

,]

Uses frequencies of 1, and stores the regression
equation to 

 only.