Variance
The variance for a Laplace random variable with location parameter mu and scale parameter b > 0 is
Usage
var variance = require( '@stdlib/stats/base/dists/laplace/variance' );
variance( mu, b )
Returns the variance for a Laplace distribution with location parameter mu and scale parameter b.
var y = variance( 2.0, 1.0 );
// returns 2.0
y = variance( 0.0, 1.0 );
// returns 2.0
y = variance( -1.0, 4.0 );
// returns 32.0
If provided NaN as any argument, the function returns NaN.
var y = variance( NaN, 1.0 );
// returns NaN
y = variance( 0.0, NaN );
// returns NaN
If provided b <= 0, the function returns NaN.
var y = variance( 0.0, 0.0 );
// returns NaN
y = variance( 0.0, -1.0 );
// returns NaN
Examples
var randu = require( '@stdlib/random/base/randu' );
var variance = require( '@stdlib/stats/base/dists/laplace/variance' );
var mu;
var b;
var y;
var i;
for ( i = 0; i < 10; i++ ) {
mu = ( randu()*10.0 ) - 5.0;
b = randu() * 20.0;
y = variance( mu, b );
console.log( 'µ: %d, b: %d, Var(X;µ,b): %d', mu.toFixed( 4 ), b.toFixed( 4 ), y.toFixed( 4 ) );
}