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 indicating positive test in a screening modality is calculated by: and explain in detail?
Ans. (a) TP/TP+FP*100SENSITIVITYTP------TP+ FNx 100PREDICTIVE VALU OF A NEGATIVE TESTTN------TN+FNx 100SPECIFICITYTP------FP+ TNx 100% OF FALSE NEGATIVESFN------TP+ FNx 100PREDICTIVE VALU OF A POSITIVE TESTTP------TP+ FPx 100% OF FALSE POSITIVESTN------FP+ TNx 100