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Re: mathematica fit data to inverse gamma distribution

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  • Subject: [mg117404] Re: [mg117354] mathematica fit data to inverse gamma distribution
  • From: Alexei Boulbitch <alexei.boulbitch at iee.lu>
  • Date: Thu, 17 Mar 2011 06:33:26 -0500 (EST)

Hi, Alex,

put "ProbabilityDensity" instead of "PDF". In other words, try this:

data1 = RandomVariate[InverseGammaDistribution[0.5, 3], 10^4];
Show[Histogram[data1, {0, 20, 1}, "ProbabilityDensity"],
  Plot[PDF[TruncatedDistribution[{0, 20},
     InverseGammaDistribution[0.5, 3]], x], {x, 0, 20},
   PlotStyle ->  Thick]]


Have fun, Alexei





Hi,

I am trying to obtain same figure that is provided in Mathematica's website related to fitting an inverse gamma to a dataset. Here is the code I enter:

data1 = RandomVariate[InverseGammaDistribution[0.5, 3], 10^4];
Show[
  Histogram[data1, {0, 20, 1}, "PDF"],
  Plot[PDF[
    TruncatedDistribution[{0, 20}, InverseGammaDistribution[0.5, 3]],
    x], {x, 0, 20}, PlotStyle ->  Thick]]


and here is the error I receive:

Histogram::hspec: The height specification PDF is not one of the named height functions or a function that can be used to compute the heights for each bin.>>
Show::"gcomb" :  StyleBox[Could not combine the graphics objects in .....

I would appreciate anyone's help.

Regards

Alex

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