Hi Will,
Your edf interpretation is not quite right. The smooths are subject to a
centring constraint for identifiability reasons, and this removes a
degree of freedom, so EDF=1 corresponds to a straight line fit.
On your second point and third points. anova(gamb1.1,gamb1.2,
test="Chisq") co
We are using GAM in mgcv (Wood), relatively new users, and wonder if anyone
can advise us on a problem we are encountering as we analyze many short time
series datasets. For each dataset, we have four models, each with intercept,
predictor x (trend), z (treatment), and int (interaction between x an
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