?aggregate ?

On Thu, Dec 24, 2009 at 7:56 AM, Graham Leask <grahamleask@btinternet.com>wrote:

> 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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