Hello list,

I am trying to perform ROC analysis and count the AUC in order to validate
my results. I use package ROCR. I would like to count the AUC not under the
cutoff found by "performance" but to use another cutoff that I calculate.
How could I change the following  command in order to get what I want?
perform=performance(pred,measure="auc",x.measure="cutoff"), where pred is a
prediction object.

Thank you very much,
Eleni

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