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RE: Curve fitting

  • To: mathgroup at
  • Subject: [mg29333] RE: [mg29323] Curve fitting
  • From: "Johannes Ludsteck" <johannes.ludsteck at>
  • Date: Thu, 14 Jun 2001 02:27:14 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Dear Tobin,

if you know that the expression in your mail is 
the PDF or CDF of a statistical distribution, you 
should write down the log-likelihood of the 
problem and maximize it with respect to the 
parameters c1,...,c5 using FindMinimum, (i.e. 
minimize the negative of the log-likelihood).

The log likelihood of the dataset is the sum of 
the log of the likelihoods/densities of each 
individual observation.

If you don't know how to set up the maximization  
you could try 



  c1 Exp[x/c2]+c3 Exp[x/c4]+c5,


but this may give inconsistent results.

Best regards,


Johannes Ludsteck
Institut fuer Volkswirtschaftslehre
Lehrstuhl Prof. Dr. Moeller
Universitaet Regensburg
Universitaetsstrasse 31
93053 Regensburg
Tel +49/0941/943-2741

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