Subsetting Data in R With Square Brackets and Logic Statements (R Tutorial 1.6) - YouTube

https://www.youtube.com/watch?annotation_id=annotation_405677033&feature=iv&list=PLqzoL9-eJTNARFXxgwbqGo56NtbJnB37A&src_vid=XaNKst8ODEQ&v=jGf7WNh-LX8

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First saved: 2015-Nov-11 (Wed)
Last checked: 2015-Nov-11 (Wed), response 200