Texas Instruments 83PL/CLM/1L1/V - 83 Plus Calc, Manual Book

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TI-83 Plus Statistics 360
CubicReg
[
Xlistname , Ylistname , freqlist , regequ
]
QuartReg—(ax
4
+bx
3
+cx
2
+ dx+e)
QuartReg
(quartic regression) fits the fourth-degree polynomial
y=ax
4
+bx
3
+cx
2
+dx+e to the data. It displays values for
a
,
b
,
c
,
d
, and
e
;
when
DiagnosticOn
is set, it also displays a value for
R
2
. For five points,
the equation is a polynomial fit; for six or more, it is a polynomial
regression. At least five points are required.
QuartReg
[
Xlistname , Ylistname , freqlist , regequ
]
LinReg—(a+bx)
LinReg(a+bx)
(linear regression) fits the model equation y=a+bx to the data
using a least-squares fit. It displays values for
a
(y-intercept) and
b
(slope);
when
DiagnosticOn
is set, it also displays values for
r
2
and
r
.
LinReg(a+bx)
[
Xlistname , Ylistname , freqlist , regequ
]
LnReg—(a+b ln(x))
LnReg
(logarithmic regression) fits the model equation y=a+b ln(x) to the
data using a least-squares fit and transformed values ln(x) and y. It
displays values for
a
and
b
; when
DiagnosticOn
is set, it also displays
values for
r
2
and
r
.