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{{alias}}( W[, mx, my] )
Returns an accumulator function which incrementally computes a moving
squared sample Pearson product-moment correlation coefficient.
The `W` parameter defines the number of values over which to compute the
moving squared sample correlation coefficient.
If provided values, the accumulator function returns an updated moving
squared sample correlation coefficient. If not provided values, the
accumulator function returns the current moving squared sample correlation
coefficient.
As `W` (x,y) pairs are needed to fill the window buffer, the first `W-1`
returned values are calculated from smaller sample sizes. Until the window
is full, each returned value is calculated from all provided values.
Parameters
----------
W: integer
Window size.
mx: number (optional)
Known mean.
my: number (optional)
Known mean.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}( 3 );
> var r2 = accumulator()
null
> r2 = accumulator( 2.0, 1.0 )
0.0
> r2 = accumulator( -5.0, 3.14 )
~1.0
> r2 = accumulator( 3.0, -1.0 )
~0.86
> r2 = accumulator( 5.0, -9.5 )
~0.74
> r2 = accumulator()
~0.74
See Also
--------
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