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This question already has an answer here:

I understand that roc curves and logistic regression both classify, but how do I connect logistic regression with classification and ROC the curve?

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marked as duplicate by gung Nov 17 '17 at 16:25

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    $\begingroup$ a roc curve does not classify. it shows tpr and fpr for all possible thresholds. you can use roc curves to evaluate your logistic regression classifier. $\endgroup$ – lnathan Nov 11 '17 at 9:21
  • $\begingroup$ I think you will find the information you need in the linked thread. Please read it. If it isn't what you want / you still have a question afterwards, come back here & edit your question to state what you learned & what you still need to know. Then we can provide the information you need without just duplicating material elsewhere that already didn't help you. $\endgroup$ – gung Nov 17 '17 at 16:26