Displaying 2 results from an estimated 2 matches for "algb".
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alg
2005 Oct 13
1
subsetting data frame using by() or tapply() or other
...e.array() or as.data.frame.list()
in front of tapply() and still have the same problem. I know this can't
be that unusual of a data manipulation and that someone has to have done
similar things before.
I want to go from something like this:
LOCID POPULATION YEAR DBC
1 algb-1 A 1992 0.70451575
2 algb-1 A 1993 0.59506851
3 algb-1 A 1997 0.84837544
4 algb-1 A 1998 0.50283182
5 algb-1 A 2000 0.91242707
6 algb-2 A 1992 0.09747155
7 algb-2 A 1993 0.84772253
8 algb-2...
2005 Oct 12
2
subsetting with by() or other function??
I think I must be missing something obvious, but I'm having trouble
getting a data transformation to work on groupings of data within a data
frame (csss3) as defined by 2 factors (population, locid). The data are
sorted by year within locid within population and I want to lag another
variable (dbc), i.e, shift them down by 1 row replacing the first row with
NA, within groups defined by