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max_t
2005 Aug 01
6
converting stata's by syntax to R
...y,
not caring which. Those observations are indicated above by keep==1.
(Note, keep <- c(1,1,1,0,0,1,0) would be fine too, but not
c(1,1,1,0,0,0,1)).
The stata code I would use is
bys fam (wt): keep if _n==_N
This is my (long-winded) attempt in R:
# first keep those rows where wt=max_fam(wt)
maxwt <- by(dat,dat$fam,function(x) max(x[,2]))
maxwt <- sapply(maxwt,"[[",1)
maxwt.dat <- data.frame("maxwt"=maxwt,"fam"=as.integer(names(maxwt)))
dat <- merge(dat,maxwt.dat)
dat <- dat[dat$wt==dat$maxwt,]
dat
Now I am stuck - I want to keep either row with...