Hi,
I’ve read several forum posts and almost have the answer to this.
I am training a TMultiLayerPerceptron - I have a tree with many more background events than signal events. So I need to set a weight to account for this as stated eg here:
root.cern.ch/phpBB2/viewtopic.php?t=2527
If I call TTree:SetWeight(), then it sets a weight for all the events in the TTree. How do I apply a weight to individual events, or even better, to events with a certain criterion?
many thanks