  Assume in a sample of size M one finds M_i representatives of species i with
i=1...N^*. The normalized frequency p^*_i=M_i/M, based on the finite sample,
may deviate considerably from the true probabilities p_i. We propose a method
to infer rank-ordered true probabilities r_i from measured frequencies M_i. We
show that the rank-ordered probabilities provide important informations on the
system, e.g., the true number of species, the Shannon- and the Renyi-entropies.
