Just wondering if anybody has played around with the proportional sum functions. In the MB manual under the Add Column statement it says to use "where within" at the end of the command. i.e. add column Road_Offset(dwellings) from Stats_data set to proportion sum(No_of_dwellings) where within After researching what "where within" actually means I find that its based on centroids. So if some of my base polygons centroids are not within my road offset polygon. Can I assume that the data from these will not be included? I changed my code to: add column Road_Offset(dwellings) from Stats_data set to proportion sum(No_of_dwellings) where intersects and got a completely different answer? Would the intersects option be more appropriate when the base data must intersect at some point, but the centroids will not necessarily fall within the polygon? Is this just a typo in the manual? Cheers Tony - - - - - - - - - - - - - - - - - - - - - - - - - - - - Tony Shepherd, GIS / IT Support Gore District Council PO Box 8, Gore, New Zealand Gore, The Brown Trout Capital .. .. .. .. coming soon! .. .. .. .. .. . www.mataura.com . .. - - - - - - - - - - - - - - - - - - - - - - - - - - - ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
