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Re: TMVA - weight(s) [message #17978 is a reply to message #17977] Sat, 07 March 2015 14:27 Go to previous messageGo to previous message
Elisabetta Prencipe (2) is currently offline  Elisabetta Prencipe (2)
Messages: 213
Registered: February 2013
first-grade participant
From: *hsi06.unitymediagroup.de
Hi Stefano,

same story: ROC curve does not change if the bkg weight is 1, 50 or 500, for example. This is nasty....
I have an old tool for the Fischer discriminat only. The possibility to add a weight was not, at that time. So, if I trained my F-discriminant with different size of bkg samples, the efficiency curve and the discriminant shape, looked different. I am confused on how TMVA works, honestly.

Here are two possibilities:

a) something is wrong with this tool;
b) the tool is ok, I do not understand how it works.

I am in favor of b)....

Any suggestion?

Elisabetta
 
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