On 9/28/2009 12:03 PM, Raymond Danner wrote:
> Dear Community,
>
> I have a data set with two columns, bird number and mass. Individual birds
> were captured 1-13 times and weighed each time. I would like to remove
> those individuals that were captured only once, so that I can assess mass
> variability per bird. I¹ve tried many approaches with no success. Can
> anyone recommend a way to remove individuals that were captured only once?
>
> Thanks,
> Ray
How about something like this?
DF <- data.frame(BIRD = rep(1:10, c(1,1,2,10,5,6,7,1,8,9)),
MASS = rnorm(50,50,10))
DF$NOBS <- with(DF, ave(MASS, BIRD, FUN=length))
subset(DF, NOBS > 1)
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