Guoyan Zhao wrote:
> Dear everyone,
>
> I have only tpr (true positive rate) and fpr (false positive rate) which
> were used to plot the ROC curve. Is there any way I can calculate the AUC
> for this curve using just this information? Any help is highly
> appreciated.
>
> Isabel
To get the AUC you need N pairs of (predicted probability or log odds,
binary outcome). AUC is quickly computed with the Hmisc somers2
function and you can get a std. error for it from the Hmisc rcorr.cens
function. You can also compute AUC from the way you stated it but that
is a roundabout way.
Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
______________________________________________
[email protected] 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.
