I am new to ROC curve, my understanding is that you need to change the threshold for the decision function to get a series of sensitivity and specificity. Does that mean for each type of classification algorithm, you need to go into that function to change the threshold of decision function to get ROC curve? Is there anyway that one can write a function so that no matter what kind of classification algorithm is used, it can plot roc curve? Could anyone refer me some available R package for ROC? 

Thanks,

James

 
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