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fieldrookery
2003 Apr 22
0
Correct SE in a poisson model.
Hi all,
I'm here again with my newbies questions :(
I have a simple example:
count of slugs in two fields.
I need to make a barplot 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