I am working with census data. My columns of interest are...
PercentOld - the percentage of people in each county that are over 65
County - the county in each state
State - the state in the US
There are about 3100 rows, with each row corresponding to a county within a
state.
I want to return the top five "PercentOld" by state. But I want the County and
the Value.
I tried this...
topN <- function(column, n=5)
{
column <- sort(column, decreasing=T)
return(column[1:n])
}
top5PerState <- tapply(data$percentOld, data$STATE, topN)
But this only returns the value for "percentOld" per state, I also want the
corresponding County.
I think I'm close, but I just can't get it...
Thanks
cn
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