repl.txt (1211B)
1 2 {{alias}}( W ) 3 Returns an accumulator function which incrementally computes a moving 4 mean absolute percentage error (MAPE). 5 6 The `W` parameter defines the number of values over which to compute the 7 moving mean absolute percentage error. 8 9 If provided input values, the accumulator function returns an updated moving 10 mean absolute percentage error. If not provided input values, the 11 accumulator function returns the current moving mean absolute percentage 12 error. 13 14 As `W` (f,a) pairs are needed to fill the window buffer, the first `W-1` 15 returned values are calculated from smaller sample sizes. Until the window 16 is full, each returned value is calculated from all provided values. 17 18 Parameters 19 ---------- 20 W: integer 21 Window size. 22 23 Returns 24 ------- 25 acc: Function 26 Accumulator function. 27 28 Examples 29 -------- 30 > var accumulator = {{alias}}( 3 ); 31 > var m = accumulator() 32 null 33 > m = accumulator( 2.0, 3.0 ) 34 ~33.33 35 > m = accumulator( 5.0, 2.0 ) 36 ~91.67 37 > m = accumulator( 3.0, 2.0 ) 38 ~77.78 39 > m = accumulator( 2.0, 5.0 ) 40 ~86.67 41 > m = accumulator() 42 ~86.67 43 44 See Also 45 -------- 46