time-to-botec/squiggle/node_modules/@stdlib/stats/base/dists/chi/mean
NunoSempere b6addc7f05 feat: add the node modules
Necessary in order to clearly see the squiggle hotwiring.
2022-12-03 12:44:49 +00:00
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Mean

Chi distribution expected value.

The expected value for a chi random variable is

Expected value for a chi distribution.

where k is the degrees of freedom.

Usage

var mean = require( '@stdlib/stats/base/dists/chi/mean' );

mean( k )

Returns the expected value of a chi distribution with degrees of freedom k.

var v = mean( 9.0 );
// returns ~2.918

v = mean( 0.5 );
// returns ~0.478

If provided k < 0, the function returns NaN.

var v = mean( -1.0 );
// returns NaN

Examples

var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var mean = require( '@stdlib/stats/base/dists/chi/mean' );

var k;
var v;
var i;

for ( i = 0; i < 10; i++ ) {
    k = randu() * 20.0;
    v = mean( k );
    console.log( 'k: %d, E(X,k): %d', k.toFixed( 4 ), v.toFixed( 4 ) );
}