Texas Instruments TI-84 Plus Guide Book

Chapter 12: Statistics 304
Note: For the regression equation, you can use the fixed-decimal mode setting to control
the number of digits stored after the decimal point (Chapter 1). However, limiting the
number of digits to a small number could affect the accuracy of the fit.
Diagnostics Display Mode
Diagnostics Display ModeDiagnostics Display Mode
Diagnostics Display Mode
When you execute some regression models, the TI-84 Plus computes and stores
diagnostics values for
r (correlation coefficient) and r
2
(coefficient of determination) or for
R
2
(coefficient of determination).
r and r
2
are computed and stored for these regression models.
R
2
is computed and stored for these regression models.
The
r and r
2
that are computed for LnReg, ExpReg, and PwrReg are based on the linearly
transformed data. For example, for
ExpReg (y=ab^x), r and r
2
are computed on
ln y=ln a+x(ln b).
LinReg(ax+b)
LinReg(a+bx)
LnReg
ExpReg
PwrReg
QuadReg CubicReg QuartReg

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	-