Abstract
Given a discrete distribution, an interesting problem is to determine the minimum size of a random sample drawn from this distribution, in order to observe a given number of different records. This problem is related with many applied problems, like the Heaps' Law in linguistics and the classical Coupon-collector's problem. In this note we are able to compute theoretically the expected size of such a sample and we provide an approximation strategy in the case of the Mandelbrot distribution.
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