Hi,
I have a question about the r package Epi. I used the following code:
rc <- ROC(form = data$event ~ data$continuous, plot="ROC")
I used this code and want to find out the optimum cutoff of my continuous
variable. It seemed it works. I also got a ROC curve indicating the
corresponding sensitivity, specificity, PV+ and PV-. However, I found
that the sensitivity and specificity are correct. But PV+ and PV- are
actually 1-PV+ and 1-PV-.
Is that what designed by the package?
Thank you.
Best,
Yanwen