Re: TMVA - weight(s) [message #17978 is a reply to message #17977] |
Sat, 07 March 2015 14:27 |
Elisabetta Prencipe (2)
Messages: 214 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
|
|
|