data item precision The probability that people with a positive screening test result do indeed have the condition of interest, taking into account the prevalence of the disease or condition. https://pubmed.ncbi.nlm.nih.gov/32541893/ Philippe Rocca-Serra adapted from wikipedia: https://en.wikipedia.org/wiki/Accuracy_and_precision#In_binary_classification last accessed: May 2016 positive predictive value precision or positive predictive value is defined as the proportion of the true positives against all the positive results (both true positives and false positives)