# 그림:Gamma distribution pdf.png

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Probability density function for the Gamma distribution

| 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:

    _ln_dgamma(x, a, b) = a*log(b) - lgamma(a) + (a-1)*log(x) - b*x
    dgamma(x, shape, rate) =\
     (x<0)? 0 :\
     (x==0)? ((shape<1)? 1/0 : (shape==1)? rate : 0) :\
     (rate==0)? 0 :\
     exp(_ln_dgamma(x, shape, rate))
    pgamma(x, shape, rate) = (x<0)? 0 : igamma(shape, x*rate)

    set samples 1001
    set terminal postscript enhanced color solid lw 2 "Times-Roman" 20
    set output

    set xtics 0,2
    set ytics 0,0.1

    f(x, k, t) = dgamma(x, k, 1.0/t)
    set key top right

    #f(x, k, t) = pgamma(x, k, 1.0/t)
    #set key bottom right

    plot [0:20] \
        f(x,1,2.0) title "{/Times-Italic k} = 1, {/Symbol q} = 2.0", \
        f(x,2,2.0) title "{/Times-Italic k} = 2, {/Symbol q} = 2.0", \
        f(x,3,2.0) title "{/Times-Italic k} = 3, {/Symbol q} = 2.0", \
        f(x,5,1.0) title "{/Times-Italic k} = 5, {/Symbol q} = 1.0", \
        f(x,9,0.5) title "{/Times-Italic k} = 9, {/Symbol q} = 0.5" lt 7

| 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 the GNU General Public License for more details.

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## 그림 링크

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