I have calculated spatial overlap of a species pair for two different seasons by using Pianka's niche overlap index. Here, I have used the frequency of occurrence of two species from camera trap data. I have also performed bootstrapping (10,000 iterations) to get a confidence interval (95%) for each of the values. Now I would like to compare these two index values for two different seasons to see whether they significantly differ from each other or not. In this case what would be the appropriate test to compare these index values?
Any help/comment/suggestion would be greatly appreciated.
Thanks!
Sankarshan
Dear Sankarshan,
two values cannot be compared, only two samples. If you have 10,000 sample from the bootstrapping for one of the seasons and 10,000 sample for the other season, then you can do the statistical comparison of the samples. The selection of the appropriate method depends on the assumptions on the the distribution of the samples (e.g. do they follow normal distribution?).
HTH,
Ákos
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