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Kurtosis
Exponential distribution excess kurtosis.
The excess kurtosis for an exponential random variable with rate parameter λ
is
Usage
var kurtosis = require( '@stdlib/stats/base/dists/exponential/kurtosis' );
kurtosis( lambda )
Returns the excess kurtosis of an exponential distribution with rate parameter lambda
.
var v = kurtosis( 9.0 );
// returns 6.0
v = kurtosis( 0.5 );
// returns 6.0
If provided lambda < 0
, the function returns NaN
.
var v = kurtosis( -1.0 );
// returns NaN
Examples
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var kurtosis = require( '@stdlib/stats/base/dists/exponential/kurtosis' );
var lambda;
var v;
var i;
for ( i = 0; i < 10; i++ ) {
lambda = randu() * 20.0;
v = kurtosis( lambda );
console.log( 'λ: %d, Kurt(X;λ): %d', lambda.toFixed( 4 ), v.toFixed( 4 ) );
}