yields True if dist is a valid distribution, and yields False otherwise.


  • DistributionParameterQ checks that numeric parameters meet parameter assumptions for the input distribution dist and assumes symbolic parameters are valid.
  • DistributionParameterQ issues a message when it encounters an invalid parameter.


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Basic Examples  (1)

Check a normal distribution with valid parameters:

A normal distribution with invalid standard deviation:

Scope  (3)

Test distributions with combinations of numeric and symbolic parameters:

Check valid univariate and multivariate discrete and continuous distributions:

Check invalid distributions:

Test a constructed distribution:

A data distribution:

Applications  (1)

Define a function for valid distributions:

The function evaluates on a distribution:

It returns unevaluated for other inputs:

Properties & Relations  (1)

DistributionParameterQ assumes symbolic parameters are valid:

DistributionParameterAssumptions returns conditions on parameters:

With numeric parameters, the outputs are equivalent:

Introduced in 2010