[R-sig-ME] Aggregate binary response variable

Graham Leask grahamleask at btinternet.com
Thu Dec 24 13:33:21 CET 2009

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Dear list

I have a response variable coded 0/1 i.e. a binary response. There are  
20,000 individual responses that I would like to aggregate into  
numbers of each category (i.e. 0/1) by
group (350 different groups) and by month (there are several hundred  
responses per month.

What is the simplest way to perform this operation in R?

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