Calculator User Manual

192
Chapter 14: Statistics
14STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 192 of 1414STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 192 of 1414STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 192 of 14
The result for a polynomial regression, sinusoidal regression, or logistic regression is stored in
PRegC
(polynomial
à
regression coefficients).
PRegC
is a list containing the coefficients for an
equation. For example, for
P3Reg
, the result
PRegC={3 5
L
2 7}
would represent
y=3x
3
+5x
2
N
2x+7.
Results of a Statistical Analysis
When you perform a statistical analysis, the calculated results are stored in the result
variables and the data from the lists used in the analysis are stored to
xStat
,
yStat
, and
fStat
.
If you edit a list or change the type of analysis, all statistical variables are cleared.
The STAT VARS (Statistical Variables) Menu
- š *
CALC EDIT PLOT DRAW VARS
vs
xSx
ws
y
4
Sy
G
x
G
x
2
G
y
G
y
2
4G
xy RegEq corr a b
4
n minX maxX minY maxY
4
Med PRegC Qrtl1 Qrtl3 tolMe
To paste a result variable to the cursor location, either select the variable from the
STAT
VARS
menu or select the variable from the
VARS STAT
selection screen.
♦
To use a result variable in an expression, paste it to the appropriate cursor location.
♦
To display the value of a result variable, paste it to the home screen and press
b
.
♦
To store results to another variable after a calculation, paste the result variable to the
home screen, press
X
, enter a new variable, and then press
b
.
PRegC
is the only statistical
result variable calculated for
a polynomial regression.
One- and two-variable
statistical functions share the
result variables.
The statistical variables are
calculated and stored as
shown in the table on the
next page.
You can use ALPHA keys,
alpha keys, and the
CHAR
GREEK
menu to enter some
result variables.