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 method I will gladly study documentation,
or if there is an example posted someplace I will follow it.
THANKS!
Julie
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