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I am on the learning curve with Grass7. I managed to make r.regression.multi work, but there is one thing that would be of high interest for me: it is possible to create a new raster showing the results (residuals) of the analysis in a new raster? This would enable me to nicely locate the areas with high residuals.

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up vote 3 down vote accepted

Yes, sure:

r.regression.multi help
...
  residuals   Map to store residuals
  estimates   Map to store estimates

The command delivers overall statistics including AIC etc. (results are identical to R) as well as a "residuals" map. I have added this in the manual page.

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Got it! I had overlooked the "optional" options. Perfect, a wonderful tool. –  Peter Apr 6 '13 at 11:32
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Glad you solved it. And unlike R, r.regression.multi works fast with gigantic data sets... –  markusN Apr 6 '13 at 21:11
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