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0221
2011 Feb 25
4
means, SD's and tapply
I'm trying to use tapply to output means and SD or SE for my data but
seem to be limited by how many times I can subset it. Here's a snippet
of my data
> stems353[1:10,]
Time DataSource Plot Elevation Aspect Slope Type Species
SizeClass Stems
1 Modern Cameron 70F221 1730 ESE 20 Conifer ABCO
Class1 3
2 Modern Cameron 70F221 1730 ESE 20 Conifer ABMA
Class1 0
3 Modern Cameron 70F221 1730 ESE 20 Hardwood ACMA
Class1 0
4 Modern Cameron 70F221 1730 ESE 20 Hardwood AECA...