In most of cases it is difficult (if not impossible) to take a simple random selection of individuals from a population with the aim of estimating the prevalence of an event. This is due to two reasons: the list of all individuals does not exist and the high cost of sampling.
The rate of homogeneity is a parameter difficult to estimate. Its actual value may be calculated from data belonging to a previous sampling of similar characteristics of the one being planned.
ProMESA is a program for statistical sampling in Animal Populations.
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