Displaying 1 result from an estimated 1 matches for "tp4661520p4661534".
2013 Mar 15
3
seeking tip to keep first of multiple observations per ID
Dear R community,
I am a neophyte and I cannot figure out how to accomplish keeping only the
first record for each ID in a data.frame that has assorted numbers of
records per ID.
I studied and found references to packages plyr and sql for R, and I fear
the documentation for those was over my head and I could not identify what
may be there to reach my goal.
If someone could point me toward a