topic Is it kosher to analyze dataset containing non-contiguous polygons for clustering with Optimized Hotspot Analysis? in Spatial Statistics Questions https://community.esri.com/t5/spatial-statistics-questions/is-it-kosher-to-analyze-dataset-containing-non/m-p/345980#M1146 <HTML><HEAD></HEAD><BODY><P>I am running a hotspot analysis on polygons assessing spatial clustering of decreases/increases in the population size of a particular bird (the increase or decrease is the weight, I am using the CONTIGUITY_EDGES_CORNERS Conceptualization of Spatial Relationships). Problematically, I have two polygons with zero nearest neighbors (no overlap, edges/corners touching--think islands). The optimized hotspot analysis runs without any issues, and one of these islands emerges as a significant cold spot. Are these results valid, or should I exclude these polygons from the analysis and only use contiguous polygons? Thank you!</P></BODY></HTML> Thu, 28 Sep 2017 17:39:50 GMT BrittanyBankovich 2017-09-28T17:39:50Z Is it kosher to analyze dataset containing non-contiguous polygons for clustering with Optimized Hotspot Analysis? https://community.esri.com/t5/spatial-statistics-questions/is-it-kosher-to-analyze-dataset-containing-non/m-p/345980#M1146 <HTML><HEAD></HEAD><BODY><P>I am running a hotspot analysis on polygons assessing spatial clustering of decreases/increases in the population size of a particular bird (the increase or decrease is the weight, I am using the CONTIGUITY_EDGES_CORNERS Conceptualization of Spatial Relationships). Problematically, I have two polygons with zero nearest neighbors (no overlap, edges/corners touching--think islands). The optimized hotspot analysis runs without any issues, and one of these islands emerges as a significant cold spot. Are these results valid, or should I exclude these polygons from the analysis and only use contiguous polygons? Thank you!</P></BODY></HTML> Thu, 28 Sep 2017 17:39:50 GMT https://community.esri.com/t5/spatial-statistics-questions/is-it-kosher-to-analyze-dataset-containing-non/m-p/345980#M1146 BrittanyBankovich 2017-09-28T17:39:50Z Re: Is it kosher to analyze dataset containing non-contiguous polygons for clustering with Optimized Hotspot Analysis? https://community.esri.com/t5/spatial-statistics-questions/is-it-kosher-to-analyze-dataset-containing-non/m-p/345981#M1147 <HTML><HEAD></HEAD><BODY><P>You did read <A href="http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-statistics-toolbox/modeling-spatial-relationships.htm#guid-729b3b01-6911-41e9-aa99-8a4cf74eee27"><STRONG>the discussion here....</STRONG></A> your call, but if you are looking for spatially contiguous processes and you have 'islands' how contiguous is your spatial sampling frame.&nbsp; It would come as no surprise that they would be a tad chilly.&nbsp; I would have a look at what happens when you remove them.&nbsp; One wouldn't want their attention drawn to something on a map (ie hot or cold) that shouldn't really be there... or would one <IMG src="https://community.esri.com/legacyfs/online/emoticons/wink.png" /></P></BODY></HTML> Thu, 28 Sep 2017 20:17:49 GMT https://community.esri.com/t5/spatial-statistics-questions/is-it-kosher-to-analyze-dataset-containing-non/m-p/345981#M1147 DanPatterson_Retired 2017-09-28T20:17:49Z