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overdispersed
2003 Apr 22
0
Correct SE in a poisson model.
...rplot with mean and SE of mean.
So I have:
The mean:
> tapply(slugs,field,mean)
Nursery Rookery
1.275 2.275
The SE:
> tapply(slugs,field,sd)/sqrt(tapply(slugs,field,length))
Nursery Rookery
0.3651264 0.3508004
If the data has been normally distributed it is correct, but it is
overdipersed count data.
I make a model
> m.poisson <- glm(slugs~field,family=quasipoisson)
And I have these coefficients:
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 0.2429 0.2490 0.976 0.3323
fieldRookery 0.5790 0.3112 1.861 0.0666 .
The e...