hi, I agree, mixture modelling can handle your specific data. for mixure modelling, try MCLUST http://www.stat.washington.edu/fraley/software.html/
There are also some good papers and reports on the site. regards, jacco ------------------------------------------- J.C. Noordam Agrotechnological Research Institute (ATO) Department Production & Control Systems P.O.Box 17,6700 AA Wageningen, the Netherlands http://www.ato.wageningen-ur.nl email : [EMAIL PROTECTED] tel: +31.317.475139 fax: +31.317.475347 > -----Original Message----- > From: shannon [mailto:shannon@;ILYA.WUSTL.EDU] > Sent: woensdag 23 oktober 2002 13:32 > To: [EMAIL PROTECTED] > Subject: Re: Clustering question > > > Hi > > I would think this could occur only in a special case where a mixture > model approach can be used. The data would need to be from > three different > multivariate normal distributions, each with the same > covariance matrix. > If you do a web search on 'mixture models' you will come up with the > information you need. > > I don't know of and can't imagine any type of hierarchical or scaling > approach that could be used. > > > Bill > --- > > William D. Shannon, Ph.D. > > Assistant Professor of Biostatistics in Medicine > Division of General Medical Sciences and Biostatistics > > Washington University School of Medicine > Campus Box 8005, 660 S. Euclid > St. Louis, MO 63110 > > Phone: 314-454-8356 > Fax: 314-454-5113 > e-mail: [EMAIL PROTECTED] > web page: http://ilya.wustl.edu/~shannon > > > On Wed, 23 Oct 2002, Marinucci, Max (MB Ergo) wrote: > > > Dear all > > > > > > I would like to know if there is some clustering provedure > which does the > > following.Given a data set with n observations on k variables with > > correlations matrix R (k x k) I would like to obtain 3 cluster of > > approximatively equal size n1=n2=n3 that satisfy the > following condition. > > > > > > The correlations matrix of each of the three subgroups > should be as close as > > possible each other and with respect to the pooled > correlation matrix, That > > is R1=R2=R3=R > > > > > > Do you have any suggestions or ideas on how to proceed to > obtain such > > partitions? > > > > > > Thanx a lot > > > > > > Massimiliano Marinucci > > > > > > Phd candidate > > > > > > Universidad Complutense Madrid > > > > > > > > > > > > > > ==================================================== > > This email is confidential and intended solely for the use of the > > individual or organisation to whom it is addressed. Any opinions or > > advice presented are solely those of the author and do not > necessarily > > represent those of the Millward Brown Group of Companies. > If you are > > not the intended recipient of this email, you should not > copy, modify, > > distribute or take any action in reliance on it. If you > have received > > this email in error please notify the sender and delete this email > > from your system. Although this email has been checked for viruses > > and other defects, no responsibility can be accepted for > any loss or > > damage arising from its receipt or use. > > ==================================================== > > >
