[R] Coding for contrasts in unbalanced designs

Guillaume Brutel guillaume.brutel at yahoo.fr
Tue Apr 3 14:53:21 CEST 2007

Sorry for possible cross posting but it seems that my previous message was send as HTML and then scrubbed.

Dear list members,

I want to use a GLM with an unbalanced factor and continuous variables.
My factor F has 12 unbalanced levels:
> summary(F)
A B C D E F G H I J K L 
1 1 4 6 6 1 2 1 2 3 1 3

I thus want to code contrasts appropriatly.
I have looked in R documentations and R-help archives without finding the information for unbalanced designs.
Any help will be very useful.
Thanks you very much.
Guillaume Brutel.

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