Texas Instruments -84 Plus, Manual Book

Page: 307 / 696

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 Mode Diagnostics 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