How to draw ROC curve from true positive rate and false positive rate

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Nithya SIvasamy
Nithya SIvasamy 2016-7-11
评论： Image Analyst 2018-3-17
I have calculated the True positive rate and false positive rate.But from this how to calculate the labels and scores in perfcurve()in matlab.
or else from True positive rate and false positive rate,how to draw the ROC curve

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回答（2 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2017-6-2
编辑：KALYAN ACHARJYA 2017-6-2
Dear,
Just calculate the sensitivity and specificity by using true positive, true negative, false positive and false negative values. The formula available in wiki just check it out.
TPR(True Positive Rate)=Sensitivity
FPR(False Negative Rate)=1-Specificity
https://en.wikipedia.org/wiki/Sensitivity_and_specificity
No to draw ROC curve use matlab line plot(1-specificity,sensitivity,'o-');
Thats the way..Still, you need help let me know here...
Thorsten
Thorsten 2016-7-11
plot(FPR, TPR)
  1 个评论
upasana verma
upasana verma 2017-2-22
plot(FPR,TPR) won't give exact curve. Not look like as ROC curve.its like a simple curve. Anyone please tell the another solution.I am also stuck over there.How to plot a ROC with TPR and FPR.

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