search for: singularites

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2006 Apr 19
1
Singularities in glm()
...aken to be 1) Null deviance: 47365.29 on 495 degrees of freedom Residual deviance: 574.64 on 487 degrees of freedom AIC: 4091.8 Number of Fisher Scoring iterations: 4 my question now is why do i get those "singularities" and where do they come from, i guess because of the singularites i get the NA's, what can i do here to avoid them? I think i have done some wrong dummy coding or something like that? By the way, i have 7 levels and only got estimates for 6 levels, whats wrong here? best regards andreas