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Bayesian Statistics I MultiCalc®   TruePos = Sensitivity * Prevalence FalsePos = (1 - Specificity) * (1 - Prevalence) TrueNeg = Specificity * (1 - Prevalence) FalseNeg = (1 - Sensitivity) * Prevalence PosPredValue = 100 * TruePos / (TruePos + FalsePos) NegPredValue = 100 * TrueNeg / (TrueNeg + FalseNeg) LRPos = Sensitivity / (1-Specificity) LRNeg = (1-Sensitivity) / Specificity PreTestOdds = Prevalence / (1 - Prevalence) PostOddsPos = PreTestOdds * LRPos PostProbPos = PostOddsPos / (1 + PostOddsPos) PostOddsNeg = PreTestOdds * LRNeg PostProbNeg = PostOddsNeg / (1 + PostOddsNeg) FalsePosRate = 100 * FalsePos / (FalsePos + TrueNeg) FalseNegRate = 100 * FalseNeg / (TruePos + FalseNeg) OverallAcc = 100 * (TruePos + TrueNeg)   Input:   Prevalence   % fraction ratio Sensitivity   % fraction ratio Specificity   % fraction ratio Results:   True Pos   % fraction ratio False Pos   % fraction ratio True Neg   % fraction ratio False Neg   % fraction ratio Pos Pred Value   % fraction ratio Neg Pred Value   % fraction ratio LR Pos   % fraction ratio LR Neg   % fraction ratio Pre Test Odds   % fraction ratio Post Odds Pos   % fraction ratio Post Prob Pos   % fraction ratio Post Odds Neg   % fraction ratio Post Prob Neg   % fraction ratio False Pos Rate   % fraction ratio False Neg Rate   % fraction ratio Overall Acc   % fraction ratio   Decimal Precision: 0 1 2 3           Related Results            Pull down to select a related equation and transfer values in common False Negative Rate from Sensitivity and Prevalence     [ Prevalence, Sensitivity ] False Negative Ratio from Sensitivity and Prevalence     [ Prevalence, Sensitivity ] False Positive Rate from Specificty and Prevalence     [ Prevalence, Specificity ] False Positive Ratio from Specificity and Prevalence     [ Prevalence, Specificity ] Likelihood Ratio MultiCalc     [ Sensitivity, Specificity ] Negative Predictive Value of a Test     [ Prevalence, Sensitivity, Specificity ] Overall Accuracy of a Test from Sensitivity, Specificity and Prevalence     [ Prevalence, Sensitivity, Specificity ] Positive Predictive Value of a Test     [ Prevalence, Sensitivity, Specificity ] Post Test Odds from Pre Test Odds and Likelihood Ratio MultiCalc     [ Prevalence ] Post Test Odds of a Negative Result from Sensitivity Specificity and Prevalence     [ Prevalence, Sensitivity, . ] Post Test Odds of a Positive Result from Sensitivity Specificity and Prevalence     [ Prevalence, Sensitivity, . ] Post Test Probability from Pre Test Probability, Sensitivity and Specificity     [ Sensitivity, Specificity ] Pre Test Odds from Prevalence     [ Prevalence ] True Negative Ratio from Specificity and Prevalence     [ Prevalence, Specificity ] True Positive Ratio from Sensitivity and Prevalence     [ Prevalence, Sensitivity ]         Legal Notices and Disclaimer   All information contained in and produced by the MedCalc 3000 system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.   MedCalc 3000 is Copyright © 1998-2010 Foundation Internet Services, LLC    [Build 240921 v9.1]