Texas Instruments TI-84 - Manual (Page 632)

Appendix B: Reference Information 629
Statistics Formulas Statistics Formulas Statistics Formulas Statistics Formulas
This section contains statistics formulas for the Logistic and SinReg regressions, ANOVA ,
2-Samp
Ü
Test , and 2-SampTTest .
Logistic Logistic Logistic Logistic
The logistic regression algorithm applies nonlinear recursive least-squares techniques to
optimize the following cost function:
which is the sum of the squares of the residual errors,
This technique attempts to estimate the constants a , b , and c recursively to make J as
small as possible.
where: x
y
N =
=
= the independent variable list
the dependent variable list
the dimension of the lists
J
c
1 ae
bx
i
–
+
------------------------ y
i
–
⎝ ⎠
⎜ ⎟
⎛ ⎞
2
i 1 =
N
∑
=