HP 39g Graphing Calculator Guide de l'utilisateur Page 106

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8-14 Statistics aplet
Two-variable
Statistic Definition
MEANX Mean of x- (independent) values.
ΣX Sum of x-values.
ΣX2 Sum of x
2
-values.
MEANY Mean of y- (dependent) values.
ΣY Sum of y-values.
ΣY2 Sum of y
2
-values.
ΣXY Sum of each xy.
SCOV Sample covariance of independent
and dependent data columns.
PCOV Population covariance of independent
and dependent data columns
CORR Correlation coefficient of the
independent and dependent data
columns for a linear fit only
(regardless of the Fit chosen). Returns
a value from 0 to 1, where 1 is the best
fit.
RELERR The relative error (for the selected fit).
Provides a measure of accuracy for
the fit.
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