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2004 Aug 13
3
removing observations
Hello R list.
I am sure this is an easy question, please forgive my 
ignorance of R.
I have a panel data set (25 years) and I would like to break 
it up by year, and run a few tests.  How is this done in R?  
In STATA it is quite simple (keep if year =1970).  If someone 
could give me an example of how to do it for a single year I 
am sure I could make a little loop to do it for all 25.