itermeanabs2

Compute the arithmetic mean of squared absolute values for all iterated values.

The arithmetic mean of squared absolute values is defined as

m equals StartFraction 1 Over n EndFraction sigma-summation Underscript i equals 0 Overscript n minus 1 Endscripts x Subscript i Superscript 2

Usage

var itermeanabs2 = require( '@stdlib/stats/iter/meanabs2' );

itermeanabs2( iterator )

Computes the arithmetic mean of squared absolute values for all iterated values.

var array2iterator = require( '@stdlib/array/to-iterator' );

var arr = array2iterator( [ 1.0, -2.0, -3.0, 4.0 ] );

var m = itermeanabs2( arr );
// returns 7.5

Notes

  • If an iterated value is non-numeric (including NaN), the returned iterator returns NaN. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.

Examples

var runif = require( '@stdlib/random/iter/uniform' );
var itermeanabs2 = require( '@stdlib/stats/iter/meanabs2' );

// Create an iterator for generating uniformly distributed pseudorandom numbers:
var rand = runif( -10.0, 10.0, {
    'seed': 1234,
    'iter': 100
});

// Compute the arithmetic mean of squared absolute values:
var m = itermeanabs2( rand );
// returns <number>

console.log( 'meanabs2: %d.', m );