Crimestat2 is a good and free alternative for single and dual kernel density. It is compatible with MapInfo for input and output (including graphics). It outputs a vertical mapper compatible grid, but you must change the extension. You can download it at: http://www.icpsr.umich.edu/NACJD/crimestat.html Dick
Richard Block Department of Sociology Loyola University 6525 N Sheridan Rd. Chicago IL 60626 Telephone 773 508 3454 FAX 773 508 7099 email [EMAIL PROTECTED] >>> Declan Troy <[EMAIL PROTECTED]> 09/04/02 19:27 PM >>> Is anyone using Vertical Mapper to do kernel analyses (creating grids based on point density)? I have two problems when I try. First, the contribution of adjacent points seems to be ignored; i.e., rather than summing densities VM appears to just overlay densities for each point; i.e., densities of each point erase any prior points they overlay. Density grids calculated using the "Square Area" method of point density analysis (which is a specific type of kernel analysis) look fine. Second, one is supposed to be able to attach weighting to points (event sum column) but again when I try this the results don't look realistic (points with high values don't correspond to higher densities in the resultant grid), even for the Square Area analysis. If anyone is using VM for kernel analysis and is either getting good results or can confirm problems with these routines please let me know. Thanks Declan Troy --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 2834 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 2847
