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The probability mass function for the yulesimon is:
for k=1,2,3,..., where \alpha>0. Here B refers to the scipy.special.beta function.
The sampling of random variates is based on pg 553, Section 6.3 of . Our notation maps to the referenced logic via \alpha=a-1.
For details see the wikipedia entry .
A Yule-Simon discrete random variable.
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