In Probability theory and Statistics, the gamma distribution is a two-parameter family of continuous Probability distributions. (https://en.wikipedia.org/wiki/Gamma_distribution)
Bayesian probability에서 사전확률(prior probability)로 사용된다.
$$ f(x;k,\theta) = x^{k-1} \frac{e^{-x/\theta}}{\theta^k \, \Gamma(k)} \ \mathrm{for}\ x > 0 \,\! $$
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