The NY Daily News conducted an analysis of subway felony and misdemeanor statistics from July 1 2008 – June 30 2013. According to the NY Daily News, the Roosevelt Island F Train subway station averaged 5,696 average daily riders and had a total of 17 crimes during the period studied. As shown in the Station Crime Report below there were:
incidents at the Roosevelt Island F Train subway station during the 5 year period
Image From the NY Daily News According to the study, the Roosevelt Island F Train subway station is one of the safety in NYC. Click here for the full article and crime statistics for every NYC subway station. 
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Also, here are Roosevelt Island F Train ridership statistics from previous post and from the MTA.