ABSTRACT
The probability is the degree of confidence in the occurrence of events. It is the measurement of events. In general, the psychiatrist knows the probability of occurrence of a particular symptom in a patient with a particular psychiatric disorder. However, it is important to know the probability of occurrence of a particular psychiatric disorder in a patient who has a particular symptom. The sensitivity of screening test is the ability of the test to detect positive cases. That is, the sensitivity is the probability that the screening test indicates a diseased case as positive. The estimation of parameters in case of sensitive information is unduly affected by the presence of high rate of false answers. This requires an indirect way of obtaining data for a reliable estimate of parameters. The statistical inferences are drawn by considering sampling distributions and calculating probabilities.
