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uristr
2009 May 01
0
Apologies: example of data needing zeros-no NA values
...of species (and therefore abundance values) listed in each treatment differs, even though they all have the same number of plots sampled.
Sample_ID Spec_num Species_ID Abundance Treatment
1 1 SOLCAN 0.05 1
2 1 SOLCAN 1.5 1
3 1 SOLCAN 2.1 2
4 1 SOLCAN 3.2 2
5 2 ERISTR 2.4 1
6 2 ERISTR 3.1 1
7 2 ERISTR 5.6 1
8 2 ERISTR 6.3 1
9 2 ERISTR 2 1
10 2 ERISTR 3 2
11 2 ERISTR 2.1 2
Sorry for the repeat posting.
cathy
ORIGINAL MESSAGE: have a dataset that I've read into R as a dataframe. There are 5 columns: Plot...