Is there any command or method to smooth ROC curve?

[Bader Bin Adwan]

Hi,

I have a roc curve that looks like a stairs, and would like to smooth it out for better presentation. I have searched and found a paper talked about command roccurve but it seems not working as it old one. Is there any command or technique to do that?

This is how the ROC curve looks like!

Thanks

[Rich Goldstein]

I'm not having any problem using -roccurve-; note that it is not a built-in command and must be downloaded and installed; have you done that? if not, use -search- to find and download/install; be sure to use the "genrocvars" option

why do you think that a smooth curve would be better for presentation?

[Bader Bin Adwan]

Well, I have installed but still give me an error message "command roccurve is unrecognized" ! I am not sure what do you mean about "genrocvars" option could you please elaborate more?

I used the command as follows:
roccurve disease_var var1 var2 if group=1

Any thoughts?

[Rich Goldstein]

my guess is that somehow it got installed incorrectly; you need to find where roccurve.ado (and its accompanying help file are); start within Stata with

which roccurve

but my guess is that you will need to re-install correctly (along the adopath) see

help adopath

the "genrocvars" option won't help you until you actually have the program in a usable form; at that point,

help roccurve

will give you help on this option

how did you "install" the program (i.e., what steps did you go through)?