[R] agglomerative coefficient in agnes (cluster)

[Weiguang Shi]

Thanks Andy. Google is really useful.

But that page doesn't answer my question, does it?

I repeat: AC highly depends on the value of the
dissimilarity of the last merge.
My question: what is the use of AC?

Weiguang
    

 --- "Liaw, Andy" <andy_liaw at merck.com> wrote: 
> 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
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide! 
> > http://www.R-project.org/posting-guide.html
> > 
> > 
> 
> 
>
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