topic Conceptualization of Spatial Relationships in Spatial Statistics Questions https://community.esri.com/t5/spatial-statistics-questions/conceptualization-of-spatial-relationships/m-p/396823#M1294 <HTML><HEAD></HEAD><BODY><SPAN>There is no option for Polygon Contiguity (First order) in this parameter.</SPAN><BR /><SPAN>There is an explanation of it's funtion in the help along with: Inverse Distance, Inverse Distance Squared,Fixed Distance Band,Zone of Indifference,Get Spatial Weights From File.&nbsp; </SPAN><BR /><BR /><BR /><BR /><SPAN>Why is this missing?</SPAN></BODY></HTML> Sat, 05 Mar 2011 06:03:54 GMT ArnoldGerber 2011-03-05T06:03:54Z Conceptualization of Spatial Relationships https://community.esri.com/t5/spatial-statistics-questions/conceptualization-of-spatial-relationships/m-p/396823#M1294 <HTML><HEAD></HEAD><BODY><SPAN>There is no option for Polygon Contiguity (First order) in this parameter.</SPAN><BR /><SPAN>There is an explanation of it's funtion in the help along with: Inverse Distance, Inverse Distance Squared,Fixed Distance Band,Zone of Indifference,Get Spatial Weights From File.&nbsp; </SPAN><BR /><BR /><BR /><BR /><SPAN>Why is this missing?</SPAN></BODY></HTML> Sat, 05 Mar 2011 06:03:54 GMT https://community.esri.com/t5/spatial-statistics-questions/conceptualization-of-spatial-relationships/m-p/396823#M1294 ArnoldGerber 2011-03-05T06:03:54Z Re: Conceptualization of Spatial Relationships https://community.esri.com/t5/spatial-statistics-questions/conceptualization-of-spatial-relationships/m-p/396824#M1295 <HTML><HEAD></HEAD><BODY><SPAN>Hi Arnold, </SPAN><BR /><BR /><SPAN>That's a great question.&nbsp; I'm guessing that you are using the Generate Spatial Weights Matrix tool, which would explain why you aren't seeing the Polygon Contiguity (First Order) option in the drop-down. In the Generate Spatial Weights Matrix tool, there are actually two options for polygon contiguity...Contiguity_Edges_Only and Contiguity_Edges_Corners.&nbsp; The Contiguity_Edges_Only option is the exact same conceptualization as Polygon Contiguity (First Order)...they both use edges only to determine if features are neighbors, while the Contiguity_Edges_Corners option uses either edges OR corners.&nbsp; A good way to think about this is by visualizing a chess board.&nbsp; The Contiguity_Edges_Only and Polygon Contiguity (First Order) options consider features neighbors ONLY if they are directly next to each other (ie they share edges).&nbsp; The Contiguity_Edges_Corners option considers features neighbors if they are next to each other, and also if they are diagonal to each other with a corner touching.&nbsp; See attached image.</SPAN><BR /><BR /><SPAN>So, there are several tools in the Spatial Statistics toolbox that refer to the edges-only option as Polygon Contiguity (first order)...including hot spot analysis, spatial autocorrelation, cluster and outlier analysis, and high/low clustering.&nbsp; The Generate Spatial Weights Matrix tool, however, calls this option CONTIGUITY_EDGES_ONLY because there are two options and those names are more descriptive.</SPAN><BR /><BR /><SPAN>Hope this helps!</SPAN><BR /><BR /><SPAN>Lauren Rosenshein</SPAN><BR /><SPAN>Geoprocessing Product Engineer</SPAN></BODY></HTML> Mon, 14 Mar 2011 20:13:59 GMT https://community.esri.com/t5/spatial-statistics-questions/conceptualization-of-spatial-relationships/m-p/396824#M1295 LaurenRosenshein 2011-03-14T20:13:59Z