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Chi-squared distribution standard deviation.
The standard deviation for a chi-squared random variable is
where k >= 0 is the degrees of freedom.
npm install @stdlib/stats-base-dists-chisquare-stdevvar stdev = require( '@stdlib/stats-base-dists-chisquare-stdev' );Returns the standard deviation of a chi-squared distribution with degrees of freedom k.
var v = stdev( 9.0 );
// returns ~4.243
v = stdev( 0.5 );
// returns 1.0If provided k < 0, the function returns NaN.
var v = stdev( -1.0 );
// returns NaNvar randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var stdev = require( '@stdlib/stats-base-dists-chisquare-stdev' );
var k;
var v;
var i;
for ( i = 0; i < 10; i++ ) {
k = randu() * 20.0;
v = stdev( k );
console.log( 'k: %d, SD(X,k): %d', k.toFixed( 4 ), v.toFixed( 4 ) );
}This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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