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Re: st: Is there a Stata package to compute the cumulative distribution of a Weibull distribution?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Is there a Stata package to compute the cumulative distribution of a Weibull distribution?
Date   Thu, 26 May 2011 00:36:43 +0100

Weibull is an obvious key word here and -findit weibull- points to
various resources, including -weibullfit- from SSC. Did you try that?

But the cdf of y that is a two-parameter Weibull is one line of Stata

gen F = 1 - exp(-((y/b)^c))

-- where b is a scale parameter and c is a shape parameter --

so it is not clear to me why you seek a package for it.

Your parameterisation may differ, but the formula is still simple.

-weibullfit- fits, and -qweibull- and -pweibull- offer standard
diagnostic plots for univariate fitting.

Nick

On Wed, May 25, 2011 at 10:49 PM, Tiago V. Pereira
<tiago.pereira@mbe.bio.br> wrote:

> Is there a Stata package to compute the cumulative distribution of a
> two-parameter Weibull distribution that I am not aware of?
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