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2008 Jan 10
0
Residual deviance in glm
...-way design of
nominal by ordinal structure like the Political Ideology Example
(Table 9.5) in Agresti's book Categorical Data Analysis. The nominal
variable is Method while the ordinal variable is Quality (Bad,
Moderate, Good, Excellent). I rank/quantify Quality with another
variable QualityR (1, 2, 3, 4), and run the following:
fm <- glm(Count ~ Quality + Method * QualityR, family=poisson, MyData)
I'm pretty happy with the significance testing of the main effects
and contrasts. However after examining the following deviances, I'm
concerned about the Poisson fitting of...