Bingo! That's exactly the idiom I was looking for.
Thanks, Andrija.
-Michael


On 4/11/2014 4:57 PM, Andrija Djurovic wrote:
another:

ave(as.numeric(Donner$family), Donner$family, FUN=length)



--
Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept. & Chair, Quantitative Methods
York University      Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA

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