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Positive rate, also known as positivity rate, rate of positivity, testing positivity rate, percent positive and percent positivity, in epidemiology, when performing a diagnostic test, is the percentage of tests performed that are positive. It is used in public health surveillance to track the spreading of a disease. The formula for calculating the rate of positivity of a diagnosis test is:

$$Rate = 100 x P / (P + N)$$

Where P is the number of positive tests results and N is the number of negative tests results.