[R] Modality Test

[Mark Difford]

Whoops! I think that should be Stuetzle --- though I very much doubt that he
reads the list.


Mark Difford wrote:
> 
> 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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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>> 
>> 
> 
> 

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