[R] agglomerative coefficient in agnes (cluster)

[Liaw, Andy]

Google really can be a very useful thing, in case you haven't found that.
This is the first hit I got with `agglomerative coefficient':

http://www.unesco.org/webworld/idams/advguide/Chapt7_1_4.htm

Andy

> From: Weiguang Shi
> 
> I haven't read the book, but could anyone explain more
> about this parameter? 
> 
> help(agnes) says that ac measures the amount of 
> clustering structure found. From the definition given
> in help(agnes.object), however, it seems that as long
> as 
> the dissimilarity of the merger in the final step of
> the
> algorithm is large enough, the ac value will be close
> to 
> 1. So what does ac really mean?
> 
> Thank you,
> Weiguang
> 
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