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diagnosis epidemiology biostatistics calculations equations mnemonic sensitivity npv formulas negativepredictivevalue positivepredictivevalue classification likelihoodratios matrix relationship strength table test usmle
Important Biostatistics and Epidemiology Equations Sensitivity = TP / (TP + FN) = true positives / disease
disease present Specificity ... Sensitivity) / Specificity ... Biostatistics #statistics ... Epidemiology #Equations #calculations ... #PPV #NPV
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
Specificity is the ... #Sensitivity #Specificity ... NegativePredictiveValue #Calculation ... #Table #PPV #NPV ... #Formulas #Statistics
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 Specificity Calculation - Probability that a test correctly identifies those without the disease (true negative rate) Specificity
Specificity Calculation ... negative rate) Specificity ... TN / (FP + TN) Specificity ... Biostatistics #statistics ... Epidemiology #Equations #calculations
Positive Predictive Value Calculation - Probability that someone with a positive test actually has the disease Positive
Predictive Value Calculation ... PositivePredictiveValue #PPV ... Biostatistics #statistics ... Epidemiology #Equations #calculations
Negative Predictive Value Calculation - Probability that someone with a negative test truly does not have
Predictive Value Calculation ... NegativePredictiveValue #NPV ... Biostatistics #statistics ... Epidemiology #Equations #calculations
It's eye-opening to realize how many tests with reasonable-appearing sensitivity or specificity will end up being
sensitivity or specificity ... despite having a specificity ... #Diagnosis #Statistics ... #Sensitivity #Specificity ... #Graph
This requires defining some general cutoff values for likelihood ratios. These are admittedly arbitrary, but
between sensitivity/specificity ... #Diagnosis #Statistics ... #Sensitivity #Specificity ... #Relationship #Graph
USMLE Epidemiology and Biostatistics Summary Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
Specificity (rule ... PPV: proportion ... FN) Higher specificity ... -> higher PPV ... Biostatistics #formulas #calculations
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