Thank you so much for your quick reply Dr. Scott. I tried the first option you suggested (find out the mean of the Edad column and substract that from each individual value on that table, create a new column with those values). It worked! I red the article you wrote with Rosenhein and Pratt (ArcUser Magazine - Winter 2011). I found it extremely useful. Unfortunately my graphic output from the Moran's I analysis shows that both, the OLS and the GWR residuals are clustered. According to what I red in another paper related to regression analysis and how to interpret its results (from the professional library of the resouce center), the Moran's I output should not show (at least in the GWR case) that residuals are clustered. I looked at log transformations on the geostatistical analysis extension. I can see those transformations happenning but I do not know how exactly apply that conversion to the data (i.e. create a new field with the log transformation values so I can use them and reduce bias). Thank you again. Leandro
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