To clarify: Is TN = 0 or do you not know TN (N)?
On 16.08.2012, at 11:51, vjyns wrote: > Hi, > > I want to plot ROC curve for my detection algorithm which detects > features in different images at two different thresholds. > > 6 different images used and obtained tp, fp and fn. No tn in my case. > > in first threshold run i obtained 6 values of tp,fp and fn. In second > threshold run agian i got 6 more. > > i had calculated tpr and fpr. How to plot ROC in this case. > > Is this possible to plot ROC curve in this case? If s, please guide me to > plot that. > > thank you. > > http://r.789695.n4.nabble.com/file/n4640474/in1.png > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/no-true-negative-data-need-roc-curve-tp4640474.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
