Skewness
The skewness for a chi random variable with degrees of freedom.k is
where μ is the mean of the distribution and σ its standard deviation.
Usage
var skewness = require( '@stdlib/stats/base/dists/chi/skewness' );
skewness( k )
Returns the skewness of a chi distribution with degrees of freedom k.
var v = skewness( 9.0 );
// returns ~0.252
v = skewness( 0.5 );
// returns ~1.544
If provided k <= 0, the function returns NaN.
var v = skewness( -1.0 );
// returns NaN
Examples
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var skewness = require( '@stdlib/stats/base/dists/chi/skewness' );
var k;
var v;
var i;
for ( i = 0; i < 10; i++ ) {
k = randu() * 20.0;
v = skewness( k );
console.log( 'k: %d, skew(X,k): %d', k.toFixed( 4 ), v.toFixed( 4 ) );
}