[R] degrees of freedom and glm

Helgi Tomasson helgito at hi.is
Mon Apr 2 19:29:06 CEST 2001

To glm-experts

Is there a simple way of counting degrees of freedom when modeling
interactions with a lot of empty cells?

I am thinking of an example of McCulagh & Nelder where glm gives df=13
but there is only scope for df=10 due to empty cells.

best regards 


Helgi Tomasson                                       FAX:  354-552-6806
University of Iceland                                PHONE:354-525-4571
Faculty of Economics and Business Administration    
email:helgito at rhi.hi.is 
Oddi v/ Sturlugotu
IS-101 Reykjavik
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