[R] help with cluster stopping rules

[Henric Nilsson (Public)]

Den 2007-02-17 08:15, GRAHAM LEASK skrev:
> Is there a function available in R that implements Mojena's Upper
> Tail Rule or that draws a Mojena plot?
> 
> I would also like to find a function that implements Duda and Hart's
> stopping rule.
> 
> Finally with function cophenet how can I achieve a straightforward
> Cophenet correlation coefficient (i.e. one number for example 0.876)

I'm neither aware of the function `cophenet' (and RSiteSearch couldn't 
find it) nor the ``...Cophenet correlation coefficient...''.

> that gives the agreement between the structure of the data as
> interpreted by the clustering method and the original data?

 From this description, you're probably looking for the cophenet*ic* 
correlation. `cophenetic' (in package `stats' that ships with R) 
computes cophenetic distances, and from these and the original distances 
it's straighforward to get what you want using `cor'. See `?cophenetic' 
for examples.


HTH,
Henric



> 
> If anyone could let me know where I can find a script file for these
> functions I would greatly appreciate it.
> 
> 
> Kind regards
> 
> 
> Dr Graham Leask Economics and Strategy Group Aston Business School 
> Aston University Aston Triangle Birmingham B4 7ET
> 
> Tel: Direct line 0121 204 3150 email g.leask at aston.ac.uk 
> [[alternative HTML version deleted]]
> 
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