Date:         Tue, 16 May 2006 16:46:16 -0400
Reply-To:     Keith McCormick <keithmc123@gmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Keith McCormick <keithmc123@gmail.com>
Subject:      Re: Two step clustering in SAS
In-Reply-To:  <9b5cfc600605160233l5d3fe0d8s304cf543da23b6e6@mail.gmail.com>
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Hi Parveen,

it is not terribly easy to find discussions of this algorithm.   Try
to find the article regarding the BIRCH algorithm (Zhang,
Ramakrishnon, and Livny,1996). Google, perhaps.

If memory serves at least Zhang was (is?) an SPSS employee so I don't
think you will be able to do it directly in SAS.

If your intention (implied) is rather to replicate it elsewhere by
writing you own algorithm that would seem a bit daunting but the
algorithm is detailed in a 6 page .pdf found under Help ... Algorithms
... TwoStep_Cluster.pdf in SPSS.

Keith McCormick

On 5/16/06, Parveen Sharma <parveen.sharma@gmail.com> wrote:
> Hi All,
>
> In SPSS 14 I have used two step clustering method to carry segmentaion
> analysis. However, I need to replicate this process in SAS.
>
>   - Does anyone have any ideas how to proceed? Also, if a code or
>   algorithm is available it will be much appreciated.
>
>
>   - Also, is the two step clustering similar to the two stage density
>   linkage process within SAS.
>
> Thanks,
> Parveen
>
> __________________________
> Parveen Sharma
>