Feature request: balanced accuracy in the scorer node?

KNIME Analytics Platform
1

Hi KNIMErs,

I was wondering if a part from the accuracy it would be possible to have also the balanced accuracy in the Scorer node. Balanced accuracy is defined as:

Balanced accuracy = (sensitivity+specificity)/2

I find this measure very useful and I think it could represent a little improvement for the scorer node.

Thank you in advance,

Gio  

2

Hi Gio, 

That looks fairly easy for 2-class classification problems, and something that we can probably do with a math formula node right after the regular scorer.  

Things get more complicated in multi-class problems and I'm not sure what the best approach would be there.  It seems like this is a topic of active research but I am not at all an expert on the subject.  I did find an interesting paper on this online with some sample R code that might be useful along with our R integration.

http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=4544&context=etd

3

OK Aaron,

Now I understand why you didn't include that in the regular scorer node.

Thanks for the clarification.