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| From | brendan.halpin@ul.ie (Brendan Halpin) |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: -cluster kmeans- with -weight- or -svyset- |
| Date | Sat, 18 Feb 2012 15:46:34 +0000 |
On Sat, Feb 18 2012, David Cefskimal wrote: > I am using the -cluster kmeans- command to look for opinion clusters [...] > kmeans- command. How to change the code including the weighting > variable w1? As far as I know, Stata can't deal with weights in any cluster procedure. In fact, though it seems possible to write code to take account of weights[1] (for those algorithms where it would matter), I don't think there are any commonly available implementations. If your weighting variable has a large range, this may be a problem (i.e., if some cases have many times the weight of others). If I understand k-means correctly, weighting would affect the centroid of each cluster and therefore the solution. On the other hand, cluster analysis is mainly a descriptive and exploratory device, and therefore the importance of weighting may be less (depending on the analyst's concerns). Regards, Brendan [1] Margareta Ackerman, Shai Ben-David, Simina Branzei, David Loker (2011) `Weighted Clustering', Arxiv:1109.1844 -- Brendan Halpin, Department of Sociology, University of Limerick, Ireland Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F1-009 x 3147 mailto:brendan.halpin@ul.ie ULSociology on Facebook: http://on.fb.me/fjIK9t http://teaching.sociology.ul.ie/bhalpin/wordpress twitter:@ULSociology * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/