How to draw ROC curve from true positive rate and false positive rate
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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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Answers (2)
KALYAN ACHARJYA
on 2 Jun 2017
Edited: KALYAN ACHARJYA
on 2 Jun 2017
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...
2 Comments
Ahsan Saleem
on 17 Mar 2018
hi,
plot(1-specificity,sensitivity,'o-'); only draws a point how to draw ROC curve ?
Thank you.
Thorsten
on 11 Jul 2016
plot(FPR, TPR)
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upasana verma
on 22 Feb 2017
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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