bugGNU Scientific Library - Bugs: bug #25498, levy skew alpha-stable...

 
 

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bug #25498: levy skew alpha-stable distribution documentation mis-plot

Submitted by:  -Deleted Account- <bjg>
Submitted on:  Thu 05 Feb 2009 03:08:35 PM UTC  
 
Category:  Documentation Severity:  3 - Normal
Operating System:  Status:  Fixed
Assigned to:  -Deleted Account- <bjg> Open/Closed:  Closed
Release:  1.12

Thu 05 Feb 2009 04:34:41 PM UTC, comment #1: 

fixed by 998fcdcf27910514716db2754168cf50b47e8272

-Deleted Account- <bjg>In charge of this item.
Thu 05 Feb 2009 03:08:35 PM UTC, original submission:  

[confirmed - need to refit the plot to new histogram]

From: dorkusmonkey <dorkusmonkey@gmail.com>
To: -email is unavailable-
Subject: [Bug-gsl] levy skew alpha-stable distribution documentation mis-plot?
Date: Mon, 2 Feb 2009 01:52:41 -0500

  On p. 218 for my copy of the gsl reference, chapter 19.13 "The Levy
skew alpha-Stable Distribution" I noticed that the plot of the
probability distribution function, p(x), (for alpha=1.0, beta=1.0,
scale=1.0) has a maximum at around y=0.06 or so.  I have estimated the
pdf myself and have found the peak for the same parameters to be
nearer to 0.3.  Are you sure that the plot of the pdf (p(x)) is
correct?

   below is a small program that estimates the integral and spits out
the pdf in the range of [-10,10] in gnuplot friendly output, along
with the cdf in comments.  I hope that I have interpreted everything
correctly and have done the integration and plot correctly, but I
would not put it past me to mess it up, so I would greatly appreciate
any clarifications of misconceptions/fallacies I might have.

Thank you,
dorkusmonkey

-Deleted Account- <bjg>In charge of this item.

 

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Follow 2 latest changes.

Date Changed by Updated Field Previous Value => Replaced by
2009-02-10 bjg Open/ClosedOpen => Closed
2009-02-05 bjg StatusConfirmed => Fixed

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