Hp 39g Graphing Calculator Manual do Utilizador Página 111

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Fitting a curve to 2VAR data
In the Plot view, press HD. This draws a curve to fit the
checked two-variable data sei(s). See “To choose the fit” on
page 8-11.
[?lot1
!§i=i;i!i
SQ
SYMB
Correlation
coefficient
Relative Error
HINT
gSg|iT(ITI5TICS SVMEnUC VIEW^^
Cl . pj cc
Fitl: 2.12195121951...
^S2: C3 C4
vFit2=itE^^Hi8MliBT
ENTEB USEE IiEFINED FIT
____________
The expression in Fit2
shows that the
slope=1.98082191781and
the 3'-intercept=2.2657.
The correlation coefficient is stored in the CORK variable. It is
a measure of fit to a linear curve only. Regardless of the Fit
model you have chosen, CORK 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 | num | to access the numeric view
and then aMfj to display the correlation values. The values
are stored in the variables when you access the Symbolic
view.
Statistics aplet
8-17
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