This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
 BUILT-IN MATHEMATICA SYMBOL

# DistributionParameterQ

 DistributionParameterQ[dist] 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.
Check a normal distribution with valid parameters:
A normal distribution with invalid standard deviation:
Check a normal distribution with valid parameters:
 Out[1]=
A normal distribution with invalid standard deviation:
 Out[2]=
 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:
DistributionParameterQ assumes symbolic parameters are valid:
DistributionParameterAssumptions returns conditions on parameters:
With numeric parameters, the outputs are equivalent:
New in 8