 Given an event "A" in a sample space, the relative frequency of "A" is the ratio "m/n", "m" being the number of outcomes in which the event "A" occurs, and "n" being the total number of outcomes of the experiment.In statistical terms, the empirical probability is an "estimate" or estimator of a probability.In simple cases, where the result of a trial only determines whether or not the specified event has occurred, modelling using a binomial distribution might be appropriate and then the empirical estimate is the maximum likelihood estimate.