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...iance-explained-by-each-term-in-a-GAM-td836513.html My first question is: Does anyone know a scientific source (paper, book,...) that explains or uses this methodology. I have read several articles, particularly in the field of ecology, that use GAM and I've never read one that dealt with the proportionof variance explained by each term of a model... and I think it's an important topic, at least for my study! My second question: if I supplied an offset to gam as an argument, should I use it in the full, reduced and null models, like I did in this example adapted from the previous post from Si...