Quadreg (Ax2+Bx+C); Cubicreg - (A3+B2+C+D); Quartreg - (A4+B3+C2+Dx+E) - Texas Instruments TI-84 Plus Manual Book

[
LinReg(ax+b)
Xlistname,Ylistname,freqlist,regequ
2
QuadReg (ax QuadReg (ax QuadReg (ax QuadReg (ax +bx+c) +bx+c) +bx+c) +bx+c)
(quadratic regression) fits the second-degree polynomial y=ax
QuadReg
data. It displays values for
2
for . For three data points, the equation is a polynomial fit; for four or more, it is a
R
polynomial regression. At least three data points are required.
[
QuadReg Xlistname,Ylistname,freqlist,regequ
CubicReg—(ax x x x CubicReg—(a
CubicReg—(a CubicReg—(a
(cubic regression) fits the third-degree polynomial y=ax
CubicReg
data. It displays values for
2
value for . For four points, the equation is a polynomial fit; for five or more, it is a
R
polynomial regression. At least four points are required.
[
CubicReg
Xlistname,Ylistname,freqlist,regequ
QuartReg—(a QuartReg—(ax x x x QuartReg—(a QuartReg—(a
(quartic regression) fits the fourth-degree polynomial y=ax
QuartReg
the data. It displays values for
2
a value for . For five points, the equation is a polynomial fit; for six or more, it is a
R
polynomial regression. At least five points are required.
Chapter 12: Statistics
, , and
a b
3 2
+bx x x x +b +cx x x x +d) +c +d)
+b +b +c +c +d) +d)
, , , and
a b c
4 3 2
+bx x x x +b +b +b +cx x x x +c +c +c + dx+e) + dx+e) + dx+e) + dx+e)
, ,
a b c
]
; when
c DiagnosticOn
]
; when
d DiagnosticOn
]
, , and ; when
d e DiagnosticOn
2
+bx+c to the
is set, it also displays a value
3 2
+bx +cx+d to the
is set, it also displays a
4 3
+bx +cx
is set, it also displays
2
+dx+e to
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