Hi everybody, I am having a problem building a ROC curve with my data using the ROCR package.
I have 10 lists of proteins such as attached (proteinlist.xls). each of the lists was calculated with a different p-value. The goal is to find the optimal p-value for the highest number of true positives as well as lowaest number of false positives. As far as I understood the explanations from the vignette of ROCR, my data of TP and FP are the labels of the prediction function. But I don't know how to assign the right predictions to these labels. BTW, Is there a way of finding the optimum in the curve? I mean to find the exact value in the ROC curve (see sheet 2 in the excel file for the ROC curve). I would like to thank for any help in advance Assa
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