[R] no true negative data, need roc curve

[vjyns]

Hi,

         Thanks a lot. I learned that the ROC used in my area was a modified
one like you mentioned, but i want to stick to that if i want to put my
result to such community.  I was new to this topic and R, you guided me a
lot and made me to understand. thank you.                                                                                                                                                                                       



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