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MathGroup Archive 2007

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Re: fit a BinomialDistribution to exptl data?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80495] Re: fit a BinomialDistribution to exptl data?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 23 Aug 2007 01:20:01 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <fagso0$8ad$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

you can't find an example, because you mix up the
probability density function of a random variable
with the realizations of that random variable, i.e.,
your data samples.

The usual way is to estimate the parameters of you distribution
from the samples and than insert the parameters in the
pdf of your choice.

Regards
   Jens

Gordon Robertson wrote:
> Given a list of data values, or a list of x-y data points for  
> plotting the data as an empirical distribution function, how can I  
> fit a BinomialDistribution to the data? The help documentation for  
> FindFit shows examples in which the user indicates which function  
> should be fit (e.g. FindFit[data, a x Log[b + c x], {a, b, c}, x]),  
> and I've been unable to find an example in which a statistical  
> distribution is being fit to data. Mathematica complains when I try the  
> following with an xy list of data that specified an EDF: FindFit 
> [xyvals, CDF[BinomialDistribution[n, pp], k], {n, pp}, k].
> 
> G
> --
> Gordon Robertson
> Canada's Michael Smith Genome Sciences Centre
> Vancouver BC Canada
> 
> 


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