[R] Question about ROCR package

David Winsemius dwinsemius at comcast.net
Sat Feb 7 21:57:51 CET 2009

If you post the code that you used, prehapsy using the sample data in  
the same package, you may get more useful replies:

    "commented, minimal, self-contained, reproducible code."

Gee, ... where have I seen that before?

Also could see the thread;


....posted last week. The preferred method is to use the proper  
extractor functions, but since you provided no code we cannot look at  
your objects. Looking at the documentation for perfomance-class  
objects I do not see mention of y.values.

David Winsemius

On Feb 7, 2009, at 3:17 PM, Waverley wrote:

> Hi,
> I have a question about ROCR package.  I got the ROC curve plotted
> without any problem following the manual.  However, I don't know to
> extract the values, e.g. y.values ( I think it is the area under the
> curve auc measure).  The return is an object of class "performance"
> which have Slots and one of the slot is "y.values".  I type the object
> and I can see them in screen.  But I want to extract the value for
> further programming and computation.  I did a summary of the object
> and it is a "S4" mode which I don't understand.
> Can someone help?
> Thanks a lot in advance.
> -- 
> Waverley @ Palo Alto
> ______________________________________________
> R-help at r-project.org 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.

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