Texas Instruments TI-83 PLUS - Manual (Page 363)

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 .