How to perform conditional count in SAP Crystal Report

I am using SAP Crystal  for VS 2010 to generate report.  I have a Boolean field named Status in the report that indicate whether a person was present or not .

I want to know whether it is possible to get the number of times a person was present/absent and how it can be implemented. In other words, I want to be able to indicate the number of Yes/No or 1/0 for a person

Any assistance would greatly appreciated.

Thank you