Comparison of the Shannon and Simpson diversities in two samples. Requires two columns of abundance data with taxa down the rows. The Shannon t test is described by e.g. Hutcheson (1970), Poole (1974), Magurran (1988). The Simpson t test is given by Brower et al. (1998). This is an alternative to the randomization test available in the Diversity permutation test module. The Shannon index here include a bias correction and may diverge slightly from the uncorrected estimates calculated elsewhere in PAST, at least for small samples. For mathematical details, see the Past manual.
References
Brower, J.E., Zar, J.H., von Ende, C.N. 1998. Field and Laboratory Methods for General Ecology. McGraw-Hill, Boston.
Hutcheson, K. 1970. A test for comparing diversities based on the Shannon formula. Journal of Theoretical Biology 29:151-154.
Magurran, A. 1988. Ecological Diversity and its Measurement. Princeton University Press.
Poole, R.W. 1974. An Introduction to Quantitative Ecology. McGraw-Hill, New York.