38 lines
862 B
Plaintext
38 lines
862 B
Plaintext
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{{alias}}( [mean] )
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Returns an accumulator function which incrementally computes an unbiased
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sample variance.
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If provided a value, the accumulator function returns an updated unbiased
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sample variance. If not provided a value, the accumulator function returns
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the current unbiased sample variance.
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If provided `NaN` or a value which, when used in computations, results in
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`NaN`, the accumulated value is `NaN` for all future invocations.
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Parameters
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----------
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mean: number (optional)
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Known mean.
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Returns
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-------
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acc: Function
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Accumulator function.
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Examples
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--------
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> var accumulator = {{alias}}();
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> var s2 = accumulator()
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null
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> s2 = accumulator( 2.0 )
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0.0
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> s2 = accumulator( -5.0 )
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24.5
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> s2 = accumulator()
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24.5
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See Also
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--------
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