Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!umich!samsung!brutus.cs.uiuc.edu!psuvax1!psuvm!auvm!UBVMS!V107REF9 From: V107REF9@UBVMS.BITNET Newsgroups: bit.listserv.gis-l Subject: Re: Cluster analysis and GIS Message-ID: Date: 7 Feb 90 14:07:00 GMT Sender: Geographic Information Systems Discussion List Reply-To: Geographic Information Systems Discussion List Lines: 26 Approved: NETNEWS@AUVM Gateway X-Delivery-Notice: SMTP MAIL FROM does not correspond to sender. X-Organization: University at Buffalo X-Envelope-to: GIS-L@UBVM.BITNET X-VMS-To: IN%"GIS-L@UBVM.BITNET" I don't quite see the utility of using ordinary cluster analysis (in SAS) in studying modifiable areal unit problem (MAUP) because the aggregation ( or clustering ) is subject to the contiguity principle while the SAS clustering (or I think any clustering procedures) will not take into account of this principle. Maybe you have found a way to modify the clustering procedure to incorporate this constraint. If so, I am interested in knowing how to do it. I have been working on the MAUP for more than half a year and I have been following the literature quite closely. Would you mind indicating what aspects of the MAUP (e.g. scale problem or the aggregation/zoning problem) you are investigating ? I know Don Cooke, who used to working for Bureau of Census, has 'invented' something called 'Geo-spreadsheet', which allows you to aggregate areal units (both dissolving polygons and aggregating polygon attributes) interactively. However, the analytical capabilities of the software is still quite limited. David Wong Dept. of Geography SUNY Buffalo Bitnet:v107ref9@ubvms P.S. Recently, G.Arbia wrote a book on the MAUP and I think the book has significantly breakthrough in this long-lasting geographical problem.