The frequency approach or experimental probability involves the estimation of the probability of an outcome as the proportion of "successful" outcomes in repeated trials.
I put "successful" in quotes because in epidemiology, a "successful" outcome is often a person catching a disease or infection and possibly dying as a result. I am not sure if anyone would consider that a success!
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when a probability experiment is repeated a large number of times, the relative frequency probability of an outcome will approach its theoretical probability.
The relative frequency of of an event is one possible measure of its probability.
The relative frequency is an estimate of the probability of an event.
The modelling of a probability distribution function for an event from a theoretical approach.
It is the empirical or experimental probability.