[R] Indexing on a variable that is a factor

Farrel Buchinsky fjbuch at gmail.com
Sat Sep 9 19:01:51 CEST 2006

It is easy to index on numeric variables.
How does one index on a variable that is a factor?

Farrel Buchinsky, MD
Pediatric Otolaryngologist
Allegheny General Hospital
Pittsburgh, PA

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