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→Predictive values
===Predictive values===
===Predictive values===
There are two types of predictive value; '''positive predictive value (PV+)''' is defined as the probability that an animal which tests positive actually has the disease and '''negative predictive value (PV-)''' is the probability and animal that tests negative does not have the disease. PV+ and PV- are calculated as follows:
===Likelihood ratio===
===Likelihood ratio===