47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
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{{alias}}( W )
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Returns an accumulator function which incrementally computes a moving
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mean absolute percentage error (MAPE).
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The `W` parameter defines the number of values over which to compute the
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moving mean absolute percentage error.
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If provided input values, the accumulator function returns an updated moving
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mean absolute percentage error. If not provided input values, the
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accumulator function returns the current moving mean absolute percentage
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error.
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As `W` (f,a) pairs are needed to fill the window buffer, the first `W-1`
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returned values are calculated from smaller sample sizes. Until the window
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is full, each returned value is calculated from all provided values.
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Parameters
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----------
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W: integer
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Window size.
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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}}( 3 );
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> var m = accumulator()
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null
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> m = accumulator( 2.0, 3.0 )
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~33.33
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> m = accumulator( 5.0, 2.0 )
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~91.67
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> m = accumulator( 3.0, 2.0 )
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~77.78
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> m = accumulator( 2.0, 5.0 )
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~86.67
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> m = accumulator()
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~86.67
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See Also
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--------
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