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deltafits
2002 Apr 01
0
something confusing about stepAIC
...ction AICc, I dug around in the code
for the functions
glm.fit
stepAIC
dropterm.glm
addterm.glm
extractAIC.glm
and came across something I just don't understand.
stepAIC() passes dropterm.glm() a model object. dropterm.glm() then fits a
number of submodels, computing for each some measure DeltaFit of the
relative change in goodness of fit. It then returns to stepAIC() with some
indication of which submodel is best. addterm.glm behaves similarly. The
problem is, both functions use the submodel deviances to compute the
DeltaFits, not the submodel AICs, even though these are available for at
le...