Re: [ECOLOG-L] Similarity index

2011-06-20 Thread Andy Rominger
Hi Rajasri, Sorry for coming to this late. Is your concern that in the case of small patches you've sampled completely, but in the case of large patches, some species may have gone undetected? If that's the case, using Chao's indices might be a good option. They try to take account of unseen

[ECOLOG-L] Similarity index

2011-06-14 Thread Rajasri Ray
Hello, I am trying to compare species composition among different patches which vary in their sizes to a great extent.I am planning to compute Jaccard's similarity index for this. For species enumeration, in some patches I have documented presence of all members (due to very small size of

Re: [ECOLOG-L] Similarity index

2011-06-14 Thread Adolf Ceska
@LISTSERV.UMD.EDU Subject: [ECOLOG-L] Similarity index Hello, I am trying to compare species composition among different patches which vary in their sizes to a great extent.I am planning to compute Jaccard's similarity index for this. For species enumeration, in some patches I have documented presence