FAGAN: Stata module for Fagan's Bayesian nomoigram

Abstract

fagan creates a plot showing the relationship between the prior probability specified by user over the range 0-1, the likelihood ratio (combination of sensitivity and specificity), and posterior test probability. fagan plots an axis on the left with the prior log-odds, an axis in the middle representing the log likelihood ratio and an axis on the right representing the posterior log-odds. Lines are then drawn from the prior probability on the left through the likelihood ratios in the center and extended to the posterior probabilities on the right.Bayes' nomogram, likelihood ratios, probability revision, post-test probability