DistributionParameterAssumptions

DistributionParameterAssumptions[dist]

gives a logical expression for assumptions on parameters in the symbolic distribution dist.

Details

Examples

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Basic Examples  (1)

Obtain parameter assumptions for a normal distribution:

Parameter assumptions for a multinomial distribution:

Scope  (4)

Obtain assumptions for distributions with combinations of numeric and symbolic parameters:

Get assumptions for univariate and multivariate discrete and continuous distributions:

Get assumptions for a derived distribution:

Data distributions have no parameters, so the assumptions are vacuously true:

Applications  (4)

Get the PDF for an extreme value distribution:

Compute the integral for its mean without including parameter assumptions:

Use parameter assumptions to simplify the result:

Compute the result by giving the assumptions directly to Integrate:

Compare with the mean of the distribution:

Define two χ2 distributions and their parameter assumptions:

Compute the pdf of the sum of the χ2 distributed variables via convolution with assumptions:

Verify the additive property of χ2 variables:

Define a Haight distribution with probability parameter :

Sum the PDF expression to check normalization:

The result is not always unity if the distribution assumptions are not met:

Give assumptions to Sum to verify the total probability is 1 for assumed values of :

Get the assumptions for a type 1 Pearson with unknown b1 and b0 parameters:

Find the maximum possible value of b1 as a function of b0:

Properties & Relations  (1)

DistributionParameterAssumptions returns conditions on parameters:

DistributionParameterQ assumes symbolic parameters are valid:

With numeric parameters, the outputs are equivalent:

Introduced in 2010
 (8.0)