Texas Instruments TI-82 STATS

Statistics 12–23
82D315~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:36 PM Printed: 10/27/05 2:53
PM Page 23 of 38
When you execute some regression models, the TI-82 STATS
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.
LinReg(ax+b) LnReg PwrReg
LinReg(a+bx) ExpReg
R
2
is computed and stored for these regression models.
QuadReg CubicReg QuartReg
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).
By default, these values are not displayed with the results of a
regression model when you execute it. However, you can set the
diagnostics display mode by executing the
DiagnosticOn or
DiagnosticOff instruction. Each instruction is in the CATALOG
(Chapter 15).
Note: To set DiagnosticOn or DiagnosticOff from the home
screen, press y [CATALOG], and then select the instruction for the
mode you want. The instruction is pasted to the home screen. Press
Í to set the mode.
When DiagnosticOn is set, diagnostics are displayed with the
results when you execute a regression model.
When DiagnosticOff is set, diagnostics are not displayed with
the results when you execute a regression model.
Diagnostics
Display Mode