topic Moran's I - non-negative values only? in Spatial Statistics Questions https://community.esri.com/t5/spatial-statistics-questions/moran-s-i-non-negative-values-only/m-p/463056#M1434 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I've been exploring SAC for some project data and just came across this line in the Moran's I tool help page:</SPAN><BR /><BR /><SPAN>"The input field should contain a variety of non-negative values."</SPAN><BR /><BR /><A href="http://resources.esri.com/help/9.3/arcgisengine/java/Gp_ToolRef/spatial_statistics_tools/spatial_autocorrelation_morans_i_spatial_statistics_.htm">http://resources.esri.com/help/9.3/arcgisengine/java/Gp_ToolRef/spatial_statistics_tools/spatial_autocorrelation_morans_i_spatial_statistics_.htm</A><BR /><BR /><SPAN>Could someone please help to explain this requirement?&nbsp; My thoughts are that maybe the tool does not use the absolute value for the variance between data points?&nbsp; I am trying to look at hot/cold spots in trend data (% change per year) which does have negatives.&nbsp; I could add a positive value to the input field to get positive values (i.e. add the minimum negative value to all data points) however I'm not sure how this would affect my results.&nbsp; Any suggestions?</SPAN><BR /><BR /><SPAN>Thanks in advance,</SPAN><BR /><SPAN>Kristin</SPAN></BODY></HTML> Thu, 25 Apr 2013 18:27:51 GMT KristinAldous 2013-04-25T18:27:51Z Moran's I - non-negative values only? https://community.esri.com/t5/spatial-statistics-questions/moran-s-i-non-negative-values-only/m-p/463056#M1434 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I've been exploring SAC for some project data and just came across this line in the Moran's I tool help page:</SPAN><BR /><BR /><SPAN>"The input field should contain a variety of non-negative values."</SPAN><BR /><BR /><A href="http://resources.esri.com/help/9.3/arcgisengine/java/Gp_ToolRef/spatial_statistics_tools/spatial_autocorrelation_morans_i_spatial_statistics_.htm">http://resources.esri.com/help/9.3/arcgisengine/java/Gp_ToolRef/spatial_statistics_tools/spatial_autocorrelation_morans_i_spatial_statistics_.htm</A><BR /><BR /><SPAN>Could someone please help to explain this requirement?&nbsp; My thoughts are that maybe the tool does not use the absolute value for the variance between data points?&nbsp; I am trying to look at hot/cold spots in trend data (% change per year) which does have negatives.&nbsp; I could add a positive value to the input field to get positive values (i.e. add the minimum negative value to all data points) however I'm not sure how this would affect my results.&nbsp; Any suggestions?</SPAN><BR /><BR /><SPAN>Thanks in advance,</SPAN><BR /><SPAN>Kristin</SPAN></BODY></HTML> Thu, 25 Apr 2013 18:27:51 GMT https://community.esri.com/t5/spatial-statistics-questions/moran-s-i-non-negative-values-only/m-p/463056#M1434 KristinAldous 2013-04-25T18:27:51Z