Expreg—(ab^x), Pwrreg—(ax^b), Logistic—c/ (1+a*e^-bx) – Texas Instruments TI-83 PLUS User Manual
Page 364
TI-83 Plus
Statistics
361
LnReg
[
Xlistname
,
Ylistname
,
freqlist
,
regequ
]
ExpReg—(ab
x
)
ExpReg
(exponential regression) fits the model equation y=ab
x
to the data
using a least-squares fit and transformed values x and ln(y). It displays
values for
a
and
b
; when
DiagnosticOn
is set, it also displays values for
r
2
and
r
.
ExpReg
[
Xlistname
,
Ylistname
,
freqlist
,
regequ
]
PwrReg—(ax
b
)
PwrReg
(power regression) fits the model equation y=ax
b
to the data using
a least-squares fit and transformed values ln(x) and ln(y). It displays
values for
a
and
b
; when
DiagnosticOn
is set, it also displays values for
r
2
and
r
.
PwrReg
[
Xlistname
,
Ylistname
,
freqlist
,
regequ
]
Logistic—c/(1+a
ä
e
L
bx
)
Logistic
fits the model equation y=c/(1+a
ä
e
L
bx
) to the data using an
iterative least-squares fit. It displays values for
a
,
b
, and
c
.
Logistic
[
Xlistname
,
Ylistname
,
freqlist
,
regequ
]