Fitting A Curve To 2Var Data - HP 39G User Manual

Fitting a curve to 2VAR data

Correlation
coefficient
Relative Error
H I N T
Statistics aplet
In the Plot view, press
checked two-variable data set(s). See "To choose the fit" on
page 8-11.
The expression in Fit2
shows that the
slope=1.98082191781 and
the y-intercept=2.2657.
The correlation coefficient is stored in the CORR variable. It is
a measure of fit to a linear curve only. Regardless of the Fit
model you have chosen, CORR relates to the linear model.
The relative error is stored in a variable named RELERR. The
relative error provides a measure of fit accuracy for all fits,
and it does depend on the Fit model you have chosen.
The relative error is a measure of the error between predicted
values and actual values based on the specified Fit. A smaller
number means a better fit.
In order to access these variables after you plot a set of
statistics, you must press
and then to display the correlation values. The values
are stored in the variables when you access the Symbolic
view.
. This draws a curve to fit the
to access the numeric view
8-17