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infect
2011 Apr 27
2
ROCR for combination of markers
...have 5 markers that can be used to detect an infection in combination. Could you please advise me how to use functions in ROCR/ other package to produce the ROC curve for a combination of markers?
I have used the following to get ROC statistics for each marker.
pred <- prediction(y$marker1, y$infectn)
perf <-performance(pred,"tpr","fpr")
plot(perf,ave="threshold",spread.estimate="boxplot")
But I want know whether we could get this for more than one marker, so we can look at how good the markers in combination to predict the infection. I'm very gra...