Dear Waverley,
Try this:

unlist(slot(perf,"y.values"))

See ?slot for more details.

HTH,

Jorge


On Sat, Feb 7, 2009 at 3:17 PM, Waverley <waverley.paloalto@gmail.com>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
>
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