How KNIME calculate the Area Under an ROC Curve (AUC_ROC)?

phmf · February 18, 2016, 8:06pm

Hi,

I would like to know which method the KNIME implements to calculate the area under a ROC curve?

Thanks for the help!

thor · February 19, 2016, 9:15am

I didn't know that there is more than one method... "Our" method is integrating the area under the curve.

mauuuuu5 · February 19, 2016, 4:21pm

Thanks Thors... is there any example workflow in Knime uploaded or in the Examples?...to see how to calculate it.

Regards

phmf · February 22, 2016, 9:21pm

Thanks Thors for the answer.

So, I think that is the Trapezoidal integration. Is this?

There are others numerical integrations. You can see here (https://en.wikipedia.org/wiki/Numerical_integration).

Regards

thor · February 22, 2016, 10:03pm

Yes, we are applying trapezoidal integration. Since the curve isn't a "smooth" curve anyway but has discrete steps this is the natural way to calculate the area.

phmf · February 23, 2016, 12:07pm

Thanks Thor for the answer.