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Evaluating the Fit for a Pareto/Bradford Distribution

user3532

Community Trekker

Joined:

May 7, 2012

JMP has features for evaluating the fit of a continuous variable to a distribution. In the JMP Pro 9.0.3 user interface, these functions can be accessed via the "Analyze, Distribution" menu. There is a nice selection of pre-loaded distribution definitions that can be used for the evaluation. I would like to evaluate fit versus a Pareto / Bradford Distribution, which is not in the list. Is it possible for me to add the equation for this distribution so that I can use it for the evaluation of fit?

Test System: SAS JMP Pro 9.0.3 32-bit, Microsoft Windows 7 Professional Service Pack 1 64-bit.

1 REPLY
ms

Super User

Joined:

Jun 23, 2011

I am not aware of a way to add items to the list.

But according to the information in the link you provided, Y = ln(X/xm) is exponentially distributed with rate alpha, where X is pareto distributed with parameter alpha and xm.

Thus, with a good estimate of xm, the minimum treshold, you can apply the tranformation using a separate column formula and fit a simple exponential distribution to the transformed data.