[R] count ties after rank?

David Winsemius dwinsemius at comcast.net
Mon Nov 21 21:16:25 CET 2011

On Nov 21, 2011, at 2:36 PM, Hao, Zhaozhe wrote:

> Hello!
>    I need to use Kruskal-Wallis test and post-hoc test (Dunn's test)  
> for my data. But when I searched around,

"Searching around" is a bit vague as a search strategy:

Try :kruskal dunn" at the location that RSiteSearch gets you to:


Or in its default settings:


> I only found this function: kruskal.test. But nothing for Dunn's test.
>    So I started to write one myself.

You are perhaps referring to what others are callng the  Nemenyi- 
Damico-Wolfe-Dunn test. See the last example in the entry that ? 
kruskal_test would have gotten you... had you known where it was.


>  But  I do not know how to count ties in the data frame. I can use  
> for loops but it seems long and unnecessary since the rank function  
> actually knows the ties. So can anyone give me a hint on how I can  
> "count" the number of ties?
>    Many thanks.

David Winsemius, MD
West Hartford, CT

More information about the R-help mailing list