Massive Prediction Problems

der_maik81

Hey Folks,

I 've gotta big problem. Perhabs someone could give me an advice. Well, I've got a binom. classification problem; 18.000 Examples, 7% of them got the label false and all the others true. I have to get a high recall on the "false" ones.

The decision tree returns only one leaf which is labeled "true". The LibSVm returns just the same (no tree of course). The confusion matrix returns 100% Recall on true and nothing (0%) on false.

That is not what I wanted :-(

I used an xval with libsvm or decision tree (gain ratio) and the performance-measurement "BinomClassificationPerformance"

If you need more information about my experimental setup, i will post it as soon as possible. 

Best wishes and lots of thanks,

Maik

TobiasMalbrecht

Hi Maik,

did you already try to "tune" your parameters (i.e. prevent radical pruning when learning the decision tree, etc.)? You can also optimize your parameters automatically. That would be my first try to reach a better performance ...

Regards,
Tobias