Sensitivity and Specificity of diagnostic tests

Disease
Positive Negative
Test Positive True Positive (TP)
 False Positive (FP)
 TP + FP
95
Negative False Negative (FN)
 True Negative (TN)
 FN + TN
27
TP + FN
103		 FP + TN
19		 122
Sensitivity:0.854368932039
Specificity:0.631578947368
Positive Predictive Value (PPV):0.926315789474
Negative Predictive Value (NPV):0.444444444444
Likelihood Ratio Positive (LR+):2.31900138696    
Likelihood Ratio Negative (LR-):0.230582524272
Source code is available at biophp.org