Modality Test
Hi Amin,
First, does R have a package that can implement the multimodality test, e.g., the Silverman test, DIP test, MAP test or Runt test.
Jeremy Tantrum (a Ph.D. student of Werner Steutzle's, c. 2003/04) did some work on this. There is some useful code on Steutzle's website: http://www.stat.washington.edu/wxs/Stat593-s03/Code/jeremy-unimodality.R I used it last year when I was trying to solve the problem of how best to compare lots of density curves (age distributions of 3 spp. of tree euphorbias from about very different 35 sites). In particular I had to ensure that I wasn't creating spurious bimodality at a particular age range when combining sites. You might find it useful. Feel free to contact me off list if the code has gone, as I think I still have it (somewhere). Regards, Mark.
Amin W. Mugera wrote:
Dear Readers: I have two issues in nonparametric statistical analysis that i need help: First, does R have a package that can implement the multimodality test, e.g., the Silverman test, DIP test, MAP test or Runt test. I have seen an earlier thread (sometime in 2003) where someone was trying to write a code for the Silverman test of multimodality. Is there any other tests that can enable me to know how many modes are in a distribution? Second, i would like to test whether two distributions are equal. Does R have a package than can implement the Li (1996) test of the equality of two distributions? Is there any other test i can use rather than the Li test? Thank you in advance for your help. Amin Mugera Graduate Student AgEcon Dept. Kansas State University
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