Dear
 Sean,

Thank you so much for  the help.

I tried with a range of thresholds from 0-0.9..As you had mentioned,the
true positive rates no doubt increased with thresholds below
0.9.However I did get some false positive rates even at a minimum threshold
of 0.1.Could you kindly explain the reason?



Is
there any method of finding the optimal threshold,maximizing the true
positive rates while minimizing the false positives,instead of randomly
choosing between 0-0.9?


Thanks in advance,

Susan.



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