You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Predictive value of a positive test is defined as- and explain in detail?
Ref:Parks 23rd edition pg 140 PPV = TP / (TP +FP) * 100 Predictive value reflects the diagnostic power of a test.