  For many applications one wishes to decide whether a certain set of numbers
originates from an equiprobability distribution or whether they are unequally
distributed. Distributions of relative frequencies may deviate significantly
from the corresponding probability distributions due to finite sample effects.
Hence, it is not trivial to discriminate between an equiprobability
distribution and non-equally distributed probabilities when knowing only
frequencies. Based on analytical results we provide a software tool which
allows to decide whether data correspond to an equiprobability distribution.
The tool is available at http://bioinf.charite.de/equifreq/. Its application is
demonstrated for the distribution of point mutations in coding genes.
