.. _variables-poisson_uncertain-lambdas:

"""""""
lambdas
"""""""


The parameter for the Poisson distribution, the expected number of events in the time interval of interest



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**Specification**

- *Alias:* None

- *Arguments:* REALLIST


**Description**


The density function for the poisson distribution is given by:

.. math:: f(x) = \frac{\lambda e^{-\lambda}}{x!}

where :math:`\lambda`  is the frequency of events happening, and ``x`` is the number of events that occur.



