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Sensitivity and specificity
2015-01-13
azim58 - Sensitivity and specificity sensitivity is true positive rate: the proportion of actual positives which are correctly identified as such specificity is true negative rate: proportion of negatives which are correctly identified as such Sensitivity = TP/(TP+FN) Specificity = TN/(TN+FP) Table Condition: Condition Positive Condition Negative Test Outcome Positive TP FP Negative FN TN Mneumonics for sensitivity and specificity http://books.google.com/books?id=HW0hr7c5l8MC&pg=PA219&lpg=PA219&am p;dq=how+can+i+remember+the+difference+between+sensitivity+and+specificity& amp;source=bl&ots=pHYR7sL1RX&sig=go-9Hy7IARwHVWCgYREluHTHmG8&hl =en&sa=X&ei=5iQEUeydE6XUiwLdnIDQAw&ved=0CEEQ6AEwAQ#v=onepage&am p;q=how%20can%20i%20remember%20the%20difference%20between%20sensitivity%20a nd%20specificity&f=false http://forums.studentdoctor.net/archive/index.php/t-125098.html =========================================================================== SeNsitive tests are Negative in health (NIH) SPecific tests are Positive in Disease (PID) =========================================================================== Sensitivity: SnOut- sensitive tests rule out diesease - meaning that on a test with high sensitivity if you test negative chances are you don't have the disease (screening). If you rule disease out this means you have few false negatives. Specificity: SpIn- specific tests rule in disease - meaning that on a test w. high specificity if you test positive chances are you got the disease (confirmatory). If you rule disease in this means you have few false positives. =========================================================================== SeNsitivity includes False Negatives SPecificity includes False Positives =========================================================================== =========================================================================== Note that a ROC curve has true positives vs false positives (1-specificity) nice sensitivity specificity article with some examples -Understanding and using sensitivity, specificity and predictive values --"C:\Users\kurtw_000\Box Sync\DocDR\2014\03-17-2014d1438\Understanding and using sensitivity, specificity and predictive values.pdf"
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