Jittering cutoff points in geom_roc()

[alexflaris]

Hi there,

Thank you for creating the plotROC package. I am trying to get the cutoff values off of the ROC curve (even in the vignette, the numbers seem to overlap the curve, e.g. in the figure below the line: ggplot(test, aes(d = D, m = M1)) + geom_roc(n.cuts = 5, labelsize = 5, labelround = 2))), but I am not seeing that as a feature for geom_roc. Is there a plan to include this possibility in the future?

Thank you, Alex

[sachsmc]

Hi Alex,

I did have plans to try using ggrepel to make the labels, but haven't worked on it yet. In the meantime you can try using the hjust, vjust, and angle arguments in the geom_roc function. Here is an example, play around with the values until it looks good for your example:

library(plotROC)
D.ex <- rbinom(50, 1, .5)
rocdata <- data.frame(D = c(D.ex, D.ex), 
                      M = c(rnorm(50, mean = D.ex, sd = .4), rnorm(50, mean = D.ex, sd = 1)), 
                      Z = c(rep("A", 50), rep("B", 50)))

ggplot(rocdata, aes(m = M, d = D)) + geom_roc(hjust = -.2, vjust = 0.4, angle = 45)