I have the data below in a dataset called test3.
What is the easiest way to get a count, by date, of all numerical values of var1, and to then add this count to the test3 dataset as a new column? What I have: date,var1,cat 1/1/2005,5,a 1/1/2005,12,a 1/1/2005,44,b 2/1/2005,1,b 2/1/2005,8,a 2/1/2005,32,z 2/1/2005,44,a 3/1/2005,5,z 3/1/2005,7,e 3/1/2005,95,s 3/1/2005,95,s 1/1/2005,NA,NA 1/1/2005,4,NA 1/1/2005,5,NA 3/1/2005,NA,NA 4/1/2005,NA,a what I want: date,var1,cat,n 1/1/2005,5,a,5 1/1/2005,12,a,5 1/1/2005,44,b,5 2/1/2005,1,b,4 2/1/2005,8,a,4 2/1/2005,32,z,4 2/1/2005,44,a,4 3/1/2005,5,z,4 3/1/2005,7,e,4 3/1/2005,95,s,4 3/1/2005,95,s,4 1/1/2005,NA,NA,5 1/1/2005,4,NA,5 1/1/2005,5,NA,5 3/1/2005,NA,NA,4 4/1/2005,NA,a,0 --------------------------------- [[alternative HTML version deleted]]
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