[R] aggregate binary response data

[Daniel Malter]

?tapply

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cuncta stricte discussurus
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Graham Leask
Sent: Thursday, December 24, 2009 7:57 AM
To: r-help at r-project.org
Subject: [R] aggregate binary response data

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 called dn (350 different groups) and by month mth (there are  
several hundred responses per month.

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

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