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1012rw_m
2011 Mar 05
3
subsetting data by specified observation number
Hi members,
I'd like to thank you guys ahead of time for the help. I'm kind of stuck.
I have a data frame with ID and position numbers:
1> head(failed.3)
id position
1 10000997 2
4 1000RW_M 2
15 1006RW_G 2
24 1012RW_M 3
28 10160917 2
30 1016RW_M 13
I'd like to use this to subset out a large dataset and keep only the
observation number corresponding to the position number. So for example,
ID 10000997 has 10 observations. I want to keep the 2nd one only.
Thanks,
-linh