I'm looking to run a generalized least squares (GLS) model to replace my OLS model. I believe the residuals of the OLS model have spatial autocorrelation (I'm not positive, but the map definitely looks so). I read that GLS models correct for autocorrelation (any kind?) of residuals. I don't see GLS as an option under the Generalized Regression platform. I don't have Arc or QGIS, R, or SAS. Suggestions?