While using TMVA Gui to get the result of the BDT training, the significance line in the cut efficiency plot seems very strange(flat ). but the text in the left lower corner seems correct. Could any one please tell me what could cause it?
I tried to comment out the dataloader->SetSignalWeightExpression and dataloader->SetBackgroundWeightExpression, then the cut efficiency plot seems fine
BTW, I am using root 6.12.07.
Thanks for reading my question!