search for: nameyear

...ions on: Name Year x y ab 2001 15 3 ab 2001 10 2 ab 2002 12 8 ab 2003 7 10 dv 2002 10 15 dv 2002 3 2 dv 2003 1 15 Before I do all the other things I need to do with this data, I need to summarize or collapse the data by name and year. I've found that I can do things like nameyear<-interaction(name,year) dataframe$nameyear<-nameyear tapply(dataframe$x,dataframe$nameyear,sum) tapply(dataframe$y,dataframe$nameyear,sum) and then bind those together. But my problem is that I need to somehow retain the original Names in my collapsed dataset, so that later I can do analyses...