Image:Inverse gamma pdf.png

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Probability density function for the Inverse-gamma distribution


GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation license, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation license".

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gnuplot source under GPL:

dinvgamma(x,a,b) = exp(a*log(b) - lgamma(a) - (a+1)*log(x) - b*1.0/x)
pinvgamma(x,a,b) = 1 - igamma(a, b*1.0/x)

set xtics 0,0.5
set ytics 0,0.5
set samples 1001
set terminal postscript enhanced color solid lw 2 "Times-Roman" 27
set output

plot [0:3] \
    dinvgamma(x,1,1)  title "{/Symbol a} = 1, {/Symbol b} = 1", \
    dinvgamma(x,2,1)  title "{/Symbol a} = 2, {/Symbol b} = 1", \
    dinvgamma(x,3,1)  title "{/Symbol a} = 3, {/Symbol b} = 1", \
    dinvgamma(x,3,.5) title "{/Symbol a} = 3, {/Symbol b} = 0.5"
This vector image was created with gnuplot.
GNU head This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See version 2 and version 3 of the GNU General Public License for more details.

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File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeDimensionsUserComment
current23:21, 22 April 20051,299×966 (152 KB)Cburnett (New parameters)
20:56, 22 April 20051,300×965 (164 KB)Cburnett (Corrected symbols: alpha instead of k and beta instead of theta {{GFDL}})
05:40, 7 April 20051,300×964 (147 KB)Cburnett (Probability density function for the Inverse-gamma distribution {{GFDL}})
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