[R] poisson fit for histogram

Francisco J. Zagmutt gerifalte28 at hotmail.com
Mon Jul 25 18:49:26 CEST 2005

Ups! Mr. Ripley is right.  I ignored the OS in the posting.  My appologies 
to Tom Isenbarger for the misleading answer.



>From: Prof Brian Ripley <ripley at stats.ox.ac.uk>
>To: "Francisco J. Zagmutt" <gerifalte28 at hotmail.com>
>CC: isen at plantpath.wisc.edu, r-help at stat.math.ethz.ch
>Subject: Re: [R] poisson fit for histogram
>Date: Sat, 23 Jul 2005 08:29:28 +0100 (BST)
>What does fit.dist do that fitdistr (MASS) does not in this context?  (It 
>plots, but that is very easy to do in base R.  However, to see if a Poisson 
>fits you need a test of goodness-of-fit.)
>BTW, `decompress and store the files in your "library" folder' is on no OS 
>(you did not mention one but Thomas did) the way to install a package. Even 
>on Windows (where it might just work) there are simpler and better ways to 
>do it, like using a menu.  Note that Lindsey does not provide pre-compiled 
>packages for MacOS X, the platform Thomas is using (and as they use 
>Fortran, people have reported that they are tricky to install on MacOS X), 
>and your recipe is `seriously' misleading there.
>On Fri, 22 Jul 2005, Francisco J. Zagmutt wrote:
>>I would first reccomend you to update your version of R.  Then download 
>>libraries rmutil and gnlm from Jim Lindsey at
>>http://www.luc.ac.be/~jlindsey/rcode.html decompress and store the files 
>>your "library" folder.   Sorry but you will have to donwload a package
>>unless you seriously want to re-invent the wheel.
>>Finally try
>>>From: Thomas Isenbarger <isen at plantpath.wisc.edu>
>>>To: r-help at stat.math.ethz.ch
>>>Subject: [R] poisson fit for histogram
>>>Date: Wed, 20 Jul 2005 10:40:51 -0500
>>>I haven't been an R lister for a bit, but I hope to enlist someone's
>>>help here.  I think this is a simple question, so I hope the answer
>>>is not much trouble.  Can you please respond directly to this email
>>>address in addition to the list (if responding to the list is
>>>I have a histogram and I want to see if the data fit a Poisson
>>>distribution.  How do I do this?  It is preferable if it could be
>>>done without having to install any or many packages.
>>>I use R Version 1.12 (1622) on OS X
>>>Thank-you very much,
>>>Tom Isenbarger
>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 272866 (PA)
>Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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