function incrmmaxabs( W ) {
	var max;
	if ( !isPositiveInteger( W ) ) {
		throw new TypeError( format( 'invalid argument. Must provide a positive integer. Value: `%s`.', W ) );
	}
	max = incrmmax( W );
	return accumulator;

	/**
	* If provided a value, the accumulator function returns an updated maximum absolute value. If not provided a value, the accumulator function returns the current maximum absolute value.
	*
	* @private
	* @param {number} [x] - input value
	* @returns {(number|null)} maximum absolute value or null
	*/
	function accumulator( x ) {
		if ( arguments.length === 0 ) {
			return max();
		}
		return max( abs( x ) );
	}
}
Returns an accumulator function which incrementally computes a moving maximum absolute value.

@param {PositiveInteger} W - window size
@throws {TypeError} must provide a positive integer
@returns {Function} accumulator function

@example
var accumulator = incrmmaxabs( 3 );

var m = accumulator();
// returns null

m = accumulator( 2.0 );
// returns 2.0

m = accumulator( -5.0 );
// returns 5.0

m = accumulator( 3.0 );
// returns 5.0

m = accumulator( 5.0 );
// returns 5.0

m = accumulator();
// returns 5.0