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Weibull distribution constructor.
npm install @stdlib/stats-base-dists-weibull-ctor
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var Weibull = require( '@stdlib/stats-base-dists-weibull-ctor' );
Returns a Weibull distribution object.
var weibull = new Weibull();
var mode = weibull.mode;
// returns 0.0
By default, k = 1.0
and lambda = 1.0
. To create a distribution having a different k
(shape parameter) and lambda
(scale parameter), provide the corresponding arguments.
var weibull = new Weibull( 2.0, 4.0 );
var mode = weibull.mode;
// returns ~2.828
A Weibull distribution object has the following properties and methods...
Shape parameter of the distribution. k
must be a positive number.
var weibull = new Weibull();
var k = weibull.k;
// returns 1.0
weibull.k = 3.0;
k = weibull.k;
// returns 3.0
Scale parameter of the distribution. lambda
must be a positive number.
var weibull = new Weibull( 2.0, 4.0 );
var lambda = weibull.lambda;
// returns 4.0
weibull.lambda = 3.0;
lambda = weibull.lambda;
// returns 3.0
Returns the differential entropy.
var weibull = new Weibull( 4.0, 12.0 );
var entropy = weibull.entropy;
// returns ~2.532
Returns the excess kurtosis.
var weibull = new Weibull( 4.0, 12.0 );
var kurtosis = weibull.kurtosis;
// returns ~-0.252
Returns the expected value.
var weibull = new Weibull( 4.0, 12.0 );
var mu = weibull.mean;
// returns ~10.877
Returns the mode.
var weibull = new Weibull( 4.0, 12.0 );
var mode = weibull.mode;
// returns ~11.167
Returns the skewness.
var weibull = new Weibull( 4.0, 12.0 );
var skewness = weibull.skewness;
// returns ~-0.087
Returns the standard deviation.
var weibull = new Weibull( 4.0, 12.0 );
var s = weibull.stdev;
// returns ~3.051
Returns the variance.
var weibull = new Weibull( 4.0, 12.0 );
var s2 = weibull.variance;
// returns ~9.311
Evaluates the cumulative distribution function (CDF).
var weibull = new Weibull( 2.0, 4.0 );
var y = weibull.cdf( 0.5 );
// returns ~0.016
Evaluates the natural logarithm of the cumulative distribution function (logCDF).
var weibull = new Weibull( 2.0, 4.0 );
var y = weibull.logcdf( 0.8 );
// returns ~-3.239
Evaluates the natural logarithm of the probability density function (PDF).
var weibull = new Weibull( 2.0, 4.0 );
var y = weibull.logpdf( 0.8 );
// returns ~-2.343
Evaluates the moment-generating function (MGF).
var weibull = new Weibull( 2.0, 4.0 );
var y = weibull.mgf( 0.5 );
// returns ~9.878
Evaluates the probability density function (PDF).
var weibull = new Weibull( 2.0, 4.0 );
var y = weibull.pdf( 0.8 );
// returns ~0.096
Evaluates the quantile function at probability p
.
var weibull = new Weibull( 2.0, 4.0 );
var y = weibull.quantile( 0.5 );
// returns ~3.33
y = weibull.quantile( 1.9 );
// returns NaN
var Weibull = require( '@stdlib/stats-base-dists-weibull-ctor' );
var weibull = new Weibull( 2.0, 4.0 );
var mu = weibull.mean;
// returns ~3.545
var mode = weibull.mode;
// returns ~2.828
var s2 = weibull.variance;
// returns ~3.434
var y = weibull.cdf( 0.8 );
// returns ~0.039
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See LICENSE.
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