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From | rraciborski@STATA.COM |
To | statalist@hsphsun2.harvard.edu |
Subject | st: spmat |
Date | Tue, 05 Apr 2011 08:11:13 -0500 |
Ashley Arnio <anarnio2@yahoo.com> has a question about -spmat export- producing unexpected results when exporting a k-nearest-neighbor matrix in a neighbor list format: > I created the matrix and ran the summary statistics. The summary > statistics revealed that a matrix was created in which each of my counties had > 5 nearest neighbors. But, when I look at the neighbor list with the following > command, > spmat export nn5 using nn5_list.txt , nlist replace > I notice that some of my counties have 0 neighbors and others have as many as > 7. > When I view the weights properties using the following command, > spmat export nn5 using nn5_properties.txt , replace > I can see that each county has five weights listed. > Why are the two lists different and how does Stata create weights for places > without neighbors? Ashley discovered a bug in -spmat export-. The bug has been fixed and Ashley should obtain the latest version of sppack by typing . ssc install sppack, replace --Rafal rraciborski@stata.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/