[R] Sensitivity calculations and ROC curves

[Bodien, Yelena Guller]

Dear R gurus,

I have some data that require sensitivity and specificity calculation and generation of an ROC curve. I first calculated the sensitivity and specificity in Excel using generic formulas (true positives/(true positive+false negative) etc. To make the ROC curves I switched to R and used the pROC package. However, the sensitivity and specificity values that the data berate through pROC are not the same as excel. I have tried the different "methods" in pROC and checked that the data are correctly represented in R. Is the R calculation different from the traditional calculations of true positive and true negative rate?

Thanks in advance for your help!

Y 


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