[R] no true negative data, need roc curve

[vjyns]

Hi,

     again i had small clarification regarding the discussion. I had 6
images of two threshold test, so can i plot 6 roc for each individual image?
or can i plot two roc curve (threshold 1 all images summed up and similar to
threshold 2)? which is the correct one?

Please clarify me in this regard. You helped me a lot, know clarify this
also

thank you.




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