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slapcat
2011 Feb 08
1
Grouping by factors in R
...hard time figuring out how to group results by certain
factors in R. I have data with the following headings:
[1] "Time" "Plot" "LatCat" "Elevation" "ElevCat"
"Aspect" "AspCat" "Slope"
[9] "SlopeCat" "Species" "SizeClass" "Stems"
and I'm trying to use a GLM to test differences in "Stems" for different
categories/factors - most importantly, I want to group things so that I
see results by "SizeClass" and then by "Species"...