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

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

Answer 1

[KALYAN ACHARJYA]

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...

[Ahsan Saleem]

hi,

plot(1-specificity,sensitivity,'o-'); only draws a point how to draw ROC curve ?

Thank you.

[Image Analyst]

Try perfcurve() in the stats toolbox.

Answer 2

[Thorsten]

plot(FPR, TPR)

[upasana verma]

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.