[R] Modality Test

[Mark Difford]

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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