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> From: Wensui Liu > > I am sorry that I did not state my question clearly. > > What I mean by data manipulation includes sort, merge, aggregate, > transpose, R has functions for doing those: sort(), merge(), aggregate(), and t(), respectively. > data export and import, format, date & time handle, and so > on, As others have pointed out, R comes with a manual on

In real world, data manipulation might take even longer time and more effort than statistical analysis and modeling. Does anyone know a good book and tutorial about data manupulation? Thank you so much. -- WenSui Liu, MS MA Senior Decision Support Analyst Division of Health Policy and Clinical Effectiveness