ggroc with several aesthetics

[Johnzav888]

Hi,

I am trying to plot two roc curves in the same figure. I would like to have different colour as well as different linetype for each. However, i can do only one at a time and not simultaneously. That is, i can have different colour but same linetype :

`ggroc(list(myrocglm, myrocrf), legacy.axes = T) + geom_abline(intercept = 0,slope = 1)`  

or different linetype but same color :

`ggroc(list(myrocglm, myrocrf), aes= "linetype", legacy.axes = T) + geom_abline(intercept = 0,slope = 1)` 

And if i try to add the color parameter in the fuction above, it works only for one value, i.e. color="red". For more i get the following error :

"Error: Aesthetics must be either length 1 or the same as the data (353): colour"

Thanks,
John

[xrobin]

Am I understanding it correctly that the problem is not about multiple curves in a single ggroc plot, but about changing multiple aestetics? I edited your question to reflect that, if it's not the case please let me know.

This sounds like a good idea, I will gave it a try.

[Johnzav888]

Yes, i guess you are right... It is straightforward to plot many roc curves in the same figure, but my question is merely how to distinguish them. For instance, in a paper it is common that you need different color but also different linetype, in order to be distinguishable also in a black&white paper...

Ps I just tried to change the title in the legend, but it doesn't work...It keeps outputing the title "name" ! See the pic below and the code i tried (myplot is the ggroc object)!

`myplot + guides(fill=guide_legend("my awesome title")) + theme(legend.position="bottom", legend.title = element_text(colour="blue", size=10, face="bold"))` 

Thanks!

[xrobin]

It should now be possible to pass multiple values to aes with the latest commit on the master branch:

ggroc(list(rocs...), aes= c("linetype", "colour"))

Please let me know if it works for you.