What is the Positive Predictive Value?

Given a positive prediction, the Positive Predictive Value (PPV) is the performance metric that tells you the probability that the true value is positive.

• It is closely related to the Negative Predictive Value, which is completely analogous.
• The complement of the Positive Predictive Value is the False Discovery Rat. They sum up to 1.
• The Positive Predictive Value gives you the answer to the question: “If the prediction is positive, what share of my prediction is truly positive?”
• The Positive Predictive Value is calculated as follows: