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{{alias}}( W[, mean] )
Returns an accumulator function which incrementally computes a moving
variance-to-mean (VMR).
The `W` parameter defines the number of values over which to compute the
moving variance-to-mean ratio.
If provided a value, the accumulator function returns an updated moving
variance-to-mean ratio. If not provided a value, the accumulator function
returns the current moving variance-to-mean ratio.
As `W` values 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.
mean: number (optional)
Known mean.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}( 3 );
> var F = accumulator()
null
> F = accumulator( 2.0 )
0.0
> F = accumulator( 1.0 )
~0.33
> F = accumulator( 3.0 )
0.5
> F = accumulator( 7.0 )
~2.55
> F = accumulator()
~2.55
See Also
--------
|
