Fitting A Curve To 2Var Data - HP 40G User Manual

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Fitting a curve to 2VAR data

Correlation
coefficient
Relative Error
H I N T
Statistics aplet
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In the Plot view, press . This draws a curve to fit the
ADU•
checked two-variable data set(s). See "To choose the fit" on
page 8-11.
H@IV•
ADU•
TCPX•
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 to access the numeric view
and then to display the correlation values. The values
TU6UT•
are stored in the variables when you access the Symbolic
view.
8-17