Date: Thu, 21 Feb 2008 10:21:56 -0500
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Susie C Y Li <susie.li@BOEHRINGER-INGELHEIM.COM>
Subject: Re: question on suitablilty of cluster analysis
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I have once done a clustering analysis of customers based on each of their
monthly consumption volumes of a product over a two-years' period. The
result of this clustering grouped these customers into "consumption trend"
groups (i.e., growth / decline / up-and-downer / flatliner groups).
Susie C Li
>The situation: I have total catch data for fish collections (summed over
>species) for some 16 years. Each year we were supposed to take three
>samples at each of 4 sites and using two different gear types. I.e., we
>16 years * 2 gears * 4 sites * 3 seasons which, by my cyphering, means 384
>samples. Of course, the world does not work like we would like it and
>sometimes a whole set of 8 samples will be missed if the water is too high
>and we can't go out and, on other times, a piece of gear may break during a
>survey and we can't reschedule a follow up.
>Note that I do not have reps so I have total catches, not means over reps.
>Would these data be suitable for a cluster analysis so that my boss can
>look at a plot and see something like years forming groups?
>Of course, there are uncontrolled variables such as percent of aquatic
>weeds in which fish can hide and which we have not measured but that's the
>life of fish biologists.
>Thoughts and comments, both positive and negative will be most welcome.