search for: abco

Dear R wizes, I have a data.frame of species abundances with column names consisting of 4 letter codes then an underscore and a number like this: abco_1, abco_2, abco_3, psm_1, psme_2, psme_3, etc. I would like to get an identifier for all the abco, and psme and other species etc. I used spec.fact<-substring(names(spec.count),1,4) To make a vector of the first 4 letters of each name. I tried using spec.groups <- un...

...put 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 Class1 0 5 Modern Cameron 70F221...