Calculate Moran's I without Attaching Weights Matrix

Discussion created by tua33450 on Oct 20, 2011
Latest reply on Oct 21, 2011 by lrosenshein-esristaff
Hi.  This is probably a really dumb question, by the way.  I am calculating Moran's I on my data with ArcGIS 10 and I realized that it does not require you to generate a spatial weights matrix to run this - instead, inputing a spatial weights matrix is optional.  How does it work if I do not input a weights matrix file?  Does ArcGIS create a matrix on the fly or is something else going on that I don't understand?  Thanks for any insight.