Texas Instruments TI-84 Plus Guide Book

Appendix B: Reference Information 629
Statistics Formulas
Statistics FormulasStatistics Formulas
Statistics Formulas
This section contains statistics formulas for the Logistic and SinReg regressions, ANOVA,
2-SampÜTest, and 2-SampTTest.
Logistic
LogisticLogistic
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
∑
=

Texas Instruments TI-84 Plus Specifications

General

Battery type	AAA
Power source	Battery
Number of batteries supported	4
Type	Graphing
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black
USB port	Yes
USB 2.0 ports quantity	1
Digits	- digits
Display number of lines	8 lines
Display number of characters	16
RAM capacity	0.024 MB
ROM capacity	0.480 MB
Storage media type	-