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Re: MisID vs Impurity [message #14228 is a reply to message #14227] Thu, 22 November 2012 17:21 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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From: 2.235.190*
Hi Klaus,
I believe that if you add more detectors, the meaning of the cut in the value we call "probability" has a different meaning, then cutting P>90% for EMC is different from P>90% in EMC+STT. If you compare the plots, once you add more detectors your efficiency with the same cut increases -> this means that you have more signal candidates in your selection -> your selection is looser, the misId increases.
In order to crosscheck really the numbers, one should select two algorithms cutting a value which provides the same efficiency. In such case one can compare purity and understand what is good and what is not good. The ROC curves could be helpful,maybe for the moment just integrated in separated momentum ranges.

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