Eda, How many permutations do you use? Have you tried setting the RNG seed via set.seed() ? Also, if you have borderline p-values that change from run to run it might indicate not so strong discrimination by the given clustering of sites.
Cheers, Peter -- Péter Sólymos 780-492-8534 | soly...@ualberta.ca | http://psolymos.github.com Alberta Biodiversity Monitoring Institute http://www.abmi.ca Boreal Avian Modelling Project http://www.borealbirds.ca On Wed, Jan 1, 2014 at 7:14 PM, Addicott Eda < eda.addic...@science.dsitia.qld.gov.au> wrote: > Why do I get inconsistent p-values for indicator values of species when > I run IndVal (in the labsdv package) on exactly the same dataset? I have > tested this with a small dataset (40 samples and 55 species) and a > larger dataset (334 samples and 545 species) and on different numbers of > clusters ranging from 2 to 8. The 'p' values change enough with > different test runs to affect the number of significant species in a > cluster. > > thanks > > Eda Addicott > Principal Botanist, Queensland Herbarium, > Australian Tropical Herbarium > ph: 07 4232 1807 fax: 07 4232 1842 > Email: eda.addic...@qld.gov.au > > Australian Tropical Herbarium > Sir Robert Norman Building (E2) JCU Cairns Campus > P.O.Box 6811 > Cairns, QLD 4870 > > > ***************************** Disclaimer **************...{{dropped:28}} > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology > > [[alternative HTML version deleted]]
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