HP 39gII, Руководство пользователя

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92 Statistics 2Var app
dependent column. Press to return to the default
view. The tables below describe the statistics displayed in
each view.
Here are the statistics computed when you press
.
Here are the statistics displayed when you press .
Statistic Definition
n
The number of data points.
r
Correlation coefficient of the
independent and dependent data
columns, based only on the linear
fit (regardless o the fit type chosen).
Returns a value from -1 to 1, where
1 and -1 indicate best fits.
R
2
The coefficient of determination,
which is the square of the
correlation coefficient. The value of
this statistics is dependent on the Fit
type chosen.
sCOV
Sample covariance of independent
and dependent data columns.
COV
Population covariance of
independent and dependent data
columns.
Σ
XY
Sum of
xy
products.
σ
Statistic Definition
Mean of
x
- (independent) values.
Σ
X
Sum of
x
-values.
Σ
X
2
Sum of
x
2
-values.
sX
The sample standard deviation of
the independent column.
X
The population standard deviation
of the independent column.
serrX
the standard error of the
independent column
x
σ