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2008 Mar 25
0
Behaviour of interactions in glm
...B, FactorA:FactorB - 
but whatever I do I always get 6 coefficients.
Really what I would like to do is to ask for FactorA*FactorB less the 
entries in the design matrix that I get from FactorA and FactorB. This 
would leave me with the design matrix being:
Record Mean  FactorA2:FactorB1  FactorA2:FactorB3
1      1     0                  0
2      1     0                  0
3      1     0                  0
4      1     1                  0
5      1     0                  0
6      1     0                  1
If anyone has any advice on how I could make this happen, I'd be very 
grateful!
Thanks i...