       Re: Mathematica: Weibull distribution fnc.

• To: mathgroup at smc.vnet.net
• Subject: [mg5377] Re: Mathematica: Weibull distribution fnc.
• From: axelrod at statwiz.com (Michael Axelrod)
• Date: Thu, 5 Dec 1996 14:50:18 -0500
• Organization: Statwiz
• Sender: owner-wri-mathgroup at wolfram.com

One uses all the distribution functions in Mathematica in pretty much the
same way. You can calculate the density function or the cumulative
distribution function at a point x by PDF[dist[args],x] or
CDF[dist[args],x] where 'dist' a named distribution and 'args' determine
the distribution. Usually 'args' will be a set of location-  scale (mean
standard deviation) parameters. Mathematica will also take moments.

A good way to interpret what the args mean for a given dist such as the
Weibull is to find the mean and variance with Mathematica--
Mean[WeibullDistribution[a,b]], Variance[WeibullDistribution[a,b]] then
check with a statistics book to see how a and b relate to the mean and
variance.

Michael Axelrod

In article <57648b\$28t at dragonfly.wolfram.com>, Brian
<riglinbd at ml.wpafb.af.mil> wrote:

> I am trying to employ a Weibull distribution in one of the
> notebooks I am working on.  However, Mathematica provides
> scant if any information on how to use this function. Could
> some one with more experience than I please enlighten me as
> to how the Weibull distribution function found in the
> Statistics'ContinuousDistribution package is used.
>
> Thank you,
> Brian Rigling

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