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{{alias}}( [mean] )
Returns an accumulator function which incrementally computes a variance-to-
mean ratio (VMR).
If provided a value, the accumulator function returns an updated accumulated
value. If not provided a value, the accumulator function returns the current
accumulated value.
If provided `NaN` or a value which, when used in computations, results in
`NaN`, the accumulated value is `NaN` for all future invocations.
Parameters
----------
mean: number (optional)
Known mean.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}();
> var D = accumulator()
null
> D = accumulator( 2.0 )
0.0
> D = accumulator( 1.0 )
~0.33
> D = accumulator()
~0.33
See Also
--------
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