Similarity within and between groups of sites with different species compositions

General
1

Hi!

I' struggling to find descriptions of how to calculate similarity indices (jaccard, sorensen or other) for groups, both within groups and between. Can anyone help me? I have looked at the jaccard(x,y) and sorensen(x,y) functions but as I understand it they can only calculate similarity between two sites which mean I would have to make a lot (!) of calculations so hope someone knows an easier way!

I have 65 sites with different species compositions and the sites are divided into 5 groups of unequal size (5, 15, 15, 15, 15) and I want to explore whether the species compositions are more similar within each group than between groups. Should I use count of species, percentage or binary data?

2

Are the species data binary (present/not present) or census (number observed)?

3

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.

If you have a query related to it or one of the replies, start a new topic and refer back with a link.