[R] removing observations
p.dalgaard at biostat.ku.dk
Fri Aug 13 16:39:04 CEST 2004
"Justin G. Gardner" <jggardne at uiuc.edu> writes:
> 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.
There are multiple answers, mostly involving the subset(), tapply(),
or by() functions. So use help(subset), etc.
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
More information about the R-help