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| From | Nick Cox <njcoxstata@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: clustering sequences - problem with cluster and clustermat |
| Date | Tue, 16 Apr 2013 11:05:25 +0100 |
I don't know what your first sentence means. But my guess is that there isn't enough memory for one of the programs called by -cluster- to create a matrix. Precisely what the memory limit is clearly of interest to you, but I can't see that it's your main problem. Your main problem is, I suggest, making your goal here clearer to yourself. 2700 observations is a _big_ classification problem, particularly when you consider that the number of comparisons goes up with the square of the number of objects. Even more crucially, clustering a single variable, which you are trying to do, can't show much -- arguably, can't show anything -- that's not evident by looking for clusters on a distribution display. With 2700 observations, a histogram might be too coarse and you will get better detail from a quantile plot or a dot plot; but what's crucial is how many distinct values there are, not the number of observations. If there are gaps, and thus clusters, they will be obvious on a sufficiently detailed graph. Otherwise your variable is a continuum. I can't improve on what is said here by Stata user Phil Ender http://www.philender.com/courses/multivariate/notes2/cluster0.html Nick njcoxstata@gmail.com On 16 April 2013 10:36, BUSSI, Margherita <mbussi@etui.org> wrote: > I've done a sequence analysis based with subcost based on the means of transitions between states. > I've got a new variable that it not a dissimilarity matrix (as I wrongly? expected) > I tried to operate a cluster analysis but I got this message: > > Cluster medianlinkage meanprob > cluster name: _clus_1 > insufficient memory for ClusterMatrix > > What memory is stata talking about? Storing? Running memory? And why Clustermatrix if when I give the command "clustermat" it does not find the matrix? > > if I ask > . cluster singlelinkage meanprob > It runs forever... > (I've 3700 observations) > > Does anyone have an idea how to solve it or where is my mistake? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/