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ppid
2009 Jul 29
4
- counting factor occurrences within a group: tapply()
Dear List,
I'm an [R] novice starting analysis of an ecological dataset containing the
basal areas of different tree species in a number of research plots.
Example data follow:
> Trees<-data.frame(SppID=as.factor(c(rep('QUEELL',2), rep('QUEALB',3),
'CORAME', 'ACENEG', 'TILAME')), BA=c(907.9, 1104.4, 113.0, 143.1, 452.3,
638.7, 791.7, 804.3), PlotID=as.factor(c('BU3F10', rep('BU3F11',2),
rep('BU3F12',5))))
> Trees
SppID BA...