I have data frames on which I want to calculate the default Bray-Curtis dissimilarity matrix using vegdist() in the vegan package. The data are proportions of individuals in each of 5 categories with the first column as the collection date. One such data frame is:
sampdate filter gather graze predate shred 1 2004-06-17 0.0093 0.8881 0.0295 0.0685 0.0046 2 2005-07-18 0.0149 0.8402 0.0951 0.0467 0.0030 3 2006-06-29 0.0217 0.7538 0.1185 0.1006 0.0055 4 2011-07-14 0.0241 0.8408 0.0645 0.0625 0.0081 5 2012-07-10 0.0114 0.4877 0.0256 0.2936 0.1818 Am I correct in assuming that I need to remove the sampdate column? Rich _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology