Hi all,
I try to make a residuals plot in a model, but the warnings occur.
> anova(m2)
Analysis of Deviance Table
Model: Negative Binomial(5.6937), link: log
Response: nind
Terms added sequentially (first to last)
Df Deviance Resid. Df Resid. Dev P(>|Chi|)
NULL 81 270.242
metros 1 0.005 80 270.237 0.943
habitat 7 92.843 73 177.395 3.222e-17
especie 1 6.843 72 170.552 0.009
metros:habitat 6 21.246 66 149.306 0.002
habitat:especie 7 50.657 59 98.649 1.073e-08
Warning message:
tests made without re-estimating theta in:
anova.negbin(m2)> plot(m2)
Warning message:
NaNs produced in: sqrt(1 - hii)
What this warnings?
With envolopes function a error occur.> envnbin(m2)
Error in solve.default(t(X) %*% W %*% X) :
singular matrix `a' in solve
Thanks for all
Ronaldo
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