Excellent! Can't wait to test it out. Already have several applications in mind. On Nov 8, 2011 1:28 AM, "Markus Metz" <[email protected]> wrote:
> Dylan Beaudette wrote: > > On Friday, October 07, 2011, Markus Metz wrote: > >> There is a new module r.regression.multi as grass7 add-on to calculate > >> multiple regressions with raster maps. The motivation for this module > >> is to calculate regression coefficients and statistics for very large > >> datasets, too large for e.g. R. The module uses less than 3 MB memory > >> for 400 million cells with one response variable and 8 predictors. > >> Including residuals, this makes a total of 4 billion numbers. > >> Calculation takes about 4 minutes for this dataset on my laptop. In > >> addition to the slope estimates, statistics provided are R squared, > >> adjusted R squared, F, AIC, corrected AIC, BIC for the full model, and > >> F, AIC, corrected AIC, BIC for each predictor. Results are identical > >> to those produced by R (with smaller test datasets). > >> > >> Markus M > >> _______________________________________________ > >> grass-stats mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/grass-stats > >> > > > > Very cool. Can this module fit models from point data, and produce > predictions > > in the form of a raster? > > Yes, as of r49130. Residuals are also available as output raster. > > Markus M >
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