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Module « scipy.stats »

Fonction erlang - module scipy.stats

Signature de la fonction erlang

def erlang(*args, **kwds) 

Description

help(scipy.stats.erlang)

An Erlang continuous random variable.

As an instance of the `rv_continuous` class, `erlang` object inherits from it
a collection of generic methods (see below for the full list),
and completes them with details specific for this particular distribution.

Methods
-------
rvs(a, loc=0, scale=1, size=1, random_state=None)
    Random variates.
pdf(x, a, loc=0, scale=1)
    Probability density function.
logpdf(x, a, loc=0, scale=1)
    Log of the probability density function.
cdf(x, a, loc=0, scale=1)
    Cumulative distribution function.
logcdf(x, a, loc=0, scale=1)
    Log of the cumulative distribution function.
sf(x, a, loc=0, scale=1)
    Survival function  (also defined as ``1 - cdf``, but `sf` is sometimes more accurate).
logsf(x, a, loc=0, scale=1)
    Log of the survival function.
ppf(q, a, loc=0, scale=1)
    Percent point function (inverse of ``cdf`` --- percentiles).
isf(q, a, loc=0, scale=1)
    Inverse survival function (inverse of ``sf``).
moment(order, a, loc=0, scale=1)
    Non-central moment of the specified order.
stats(a, loc=0, scale=1, moments='mv')
    Mean('m'), variance('v'), skew('s'), and/or kurtosis('k').
entropy(a, loc=0, scale=1)
    (Differential) entropy of the RV.
fit(data)
    Parameter estimates for generic data.
    See `scipy.stats.rv_continuous.fit <https://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.rv_continuous.fit.html#scipy.stats.rv_continuous.fit>`__ for detailed documentation of the
    keyword arguments.
expect(func, args=(a,), loc=0, scale=1, lb=None, ub=None, conditional=False, **kwds)
    Expected value of a function (of one argument) with respect to the distribution.
median(a, loc=0, scale=1)
    Median of the distribution.
mean(a, loc=0, scale=1)
    Mean of the distribution.
var(a, loc=0, scale=1)
    Variance of the distribution.
std(a, loc=0, scale=1)
    Standard deviation of the distribution.
interval(confidence, a, loc=0, scale=1)
    Confidence interval with equal areas around the median.

See Also
--------
gamma

Notes
-----
The Erlang distribution is a special case of the Gamma distribution, with
the shape parameter `a` an integer.  Note that this restriction is not
enforced by `erlang`. It will, however, generate a warning the first time
a non-integer value is used for the shape parameter.

Refer to `gamma` for examples.

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