Returns an accumulator function which incrementally computes the mean absolute percentage error.
accumulator function
var accumulator = incrmape();
var m = accumulator();
// returns null
m = accumulator( 2.0, 3.0 );
// returns ~33.33
m = accumulator( 5.0, 2.0 );
// returns ~91.67
m = accumulator();
// returns ~91.67
If provided input values, the accumulator function returns an updated mean absolute percentage error. If not provided input values, the accumulator function returns the current mean absolute percentage error.
Notes
NaN
or a value which, when used in computations, results inNaN
, the accumulated value isNaN
for all future invocations.input value
input value
mean absolute percentage error or null