[R] Grouping binary data

[Henric Nilsson]

Dear all,

I'm analyzing a binary outcome using glm() with a binomial distribution and 
a logit link, and have now reached the point where I'd like to do some 
model checking. Since my data are in binary form I'd like to collapse over 
the cross-classification of the factors before the model checking.

Are there any nice and simple ways doing this? If so, how? If not, I'd be 
grateful for receiving some hints on how this can be accomplished.

Many thanks,
Henric

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Henric Nilsson, Statistician

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