Hello all, I want to calculate classic diversity indexes from my zooplankton samples. The problem is that the number of individuals is not the same in all cases (some samples were semi-empty) and that is the case for the amount of sample I analysed. In order to standardise for effort, I want to do the following: a) randomly sample e.g. 50 individuals from each of my sample, so that I standardise for effort (that's the difficult part) b) then calculate on this newly created matrix all the typical indexes (that's the easy part) I ll give an example of a dataset in R, where samples are rows and species are columns:
0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 85 0 0 0 0 0 0 0 45 5 57 0 0 0 0 0 0 0 13 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 0 3 0 0 12 8 0 57 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 59 0 0 0 0 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 105 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 100 0 0 0 35 0 55 0 0 0 0 0 0 1 4 0 0 0 0 0 0 0 0 0 0 0 0 0 34 21 0 0 0 0 0 0 0 0 9 17 0 0 0 0 54 0 0 0 27 5 0 0 0 0 1 0 0 0 1 0 0 0 0 0 17 0 0 0 54 3 0 0 0 1 0 0 1 0 6 10 0 0 0 1 18 0 0 0 1 2 0 6 2 0 5 0 0 0 35 57 0 0 0 0 3 0 0 0 4 3 0 0 0 0 0 0 0 0 6 5 0 0 0 0 0 0 0 0 5 4 0 0 0 10 5 8 10 0 25 19 0 0 0 0 2 7 0 0 6 11 0 0 0 15 0 0 0 0 8 7 0 0 0 13 2 0 0 0 20 11 0 0 0 13 0 0 0 0 0 11 0 0 0 8 0 0 0 0 15 10 0 0 0 0 1 0 32 1 13 12 0 0 0 Anybody any ideas how to do this in R? -- View this message in context: http://r-sig-ecology.471788.n2.nabble.com/Diversity-on-standardised-densities-in-R-tp7578474.html Sent from the r-sig-ecology mailing list archive at Nabble.com. _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
