Duttileul's method
Hi all, I am currently looking for a possibility to calculate the geographically effective degrees of freedom of a (non-spatial ordinary least squares) regression model in the presence of spatial autocorrelation within a gridded dataset. My regression model has spatial autocorrelation in the residuals (indicated by Moran's I values) but I do not want to use a spatial model (e.g. errorsarlm in package spdep). Instead, I would like to calculate the significance tests of my (non-spatial) regression model using the reduced degrees of freedom. I know that there is the Duttileul's method (Duttileul 1993) in other software packages which does exactly this. Is there anything comparable in R? Is there a function in the spdep (or any other) package which allows this to be computed? I am very happy to get feedback. Best regards Daniel -------------------------------------------------------------------- W. Daniel Kissling Community & Macroecology Group Institut f?r Zoologie, Abteilung ?kologie Johannes Gutenberg-Universit?t Mainz D-55099 Mainz, Germany Tel. +49 (0)6131 3925200 Fax +49 (0)6131 3923731 E-mail: kissling at uni-mainz.de Personal: http://www.danielkissling.de/ Research Group: http://www.oekologie.biologie.uni-mainz.de/commecol/main.html Virtual Institute Macroecology: http://www.ufz.de/index.php?en=6302 Centre of Macroecology: http://www.macroecology.ku.dk/