Estimating Weibull parameters - R-help

Tue, Aug 6, 2002 1:46 AM #

Hi R-Community,

I have a vector of Weibull distributed observations and I would like to 
estimate the parameters "shape" and "scale" of the Weibull distribution. 
Is there a way to do this in R?

Much thanks in advance,

Hagen Schm?ller

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Dipl.-Ing. Hagen K. Schm?ller
Institut f?r Elektrische Anlagen und Energiewirtschaft, RWTH Aachen
Schinkelstra?e 6, D-52056 Aachen, Germany
Tel.: +49 (0)241 - 80 - 96734
Fax : +49 (0)241 - 80 - 92197
Hagen.Schmoeller at iaew.rwth-aachen.de


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Brian Ripley

Tue, Aug 6, 2002 2:13 AM #

On Tue, 6 Aug 2002, Hagen [ISO-8859-1] SchmÃ¶ller wrote:

Many ways.  Perhaps the simplest is function fitdistr in package MASS.
Another is via survreg() in package survival.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Martin Maechler

Tue, Aug 6, 2002 2:31 AM #

Hagen> I have a vector of Weibull distributed observations
    Hagen> and I would like to estimate the parameters "shape"
    Hagen> and "scale" of the Weibull distribution.  Is there a
    Hagen> way to do this in R?

Yes, use the  fitdistr() function from the MASS package.
Its help file starts as

Regards,

Martin Maechler <maechler at stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO C16	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><

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