As in any pattern recognition problem,
I have a set of N variables which are used to discriminate signal from background.
My question is the following: Is it possible to use such a variable which is not always available for every event?
I would like to exploit the discriminating power of this variable when it is defined (available), but not to play a role when it is not.
This variable range from -40. to 10., and use to be closer to 10. for signal events.
When it is not available, I am currently assigning it a dummy value: -999.
But I wonder if this is the proper way of doing this.
Thanks in advance…