Re: [R-sig-Geo] Open source GIS and R

Greetings, I don't mean to hijack this thread, but do the Grass users have a suggestion as to the best way to learn the program? The manual is somewhat helpful, but there must be something out there a little more user friendly. Thanks - Original Message - From: stephen sefick Date: F

Re: [R-sig-Geo] negative r-squares

bout this outlier. Don't forget that the mean of the test set does contain this outlier. Hence, R2 can easily become negative when evaluated over a different data set then the regression model was derived from. On 09/09/2010 06:25 PM, Jason Gasper wrote: Hello Pinar, I don't know

Re: [R-sig-Geo] negative r-squares

aslan...@metu.edu.tr ___ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo -- Jason Gasper National Marine Fisheries Service Alaska Region, Sustainable Fisheries Division 709 W. 9th St. Juneau, Alaska 99801 Juneau, Alask

[R-sig-Geo] Weighted Head-Banging and Weighted Median

-- Jason Gasper National Marine Fisheries Service Alaska Region, Sustainable Fisheries Division 709 W. 9th St. Juneau, Alaska 99801 Juneau, Alaska 99801 ___ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo

Re: [R-sig-Geo] resampling grids

Hello David, I am not sure I completly understand what you want to do, but Hawths tools (a free add in for arcMAP) has a resampling function that may be of use: http://www.spatialecology.com/htools/rndselss.php. Spatial analyst also has some resampling functions. If you have access to ESRI

[R-sig-Geo] Ordering shapefile

I am using the readShapePoly() function in the maptools package to read in shape files. I need to order an attribute in the shapefile in ascending order. For example, I have three attributes: C1,C2,C3 C1 C2 C3 [1,] -0.5658135 0.0374106 -1.7702093 [2,] 0.6783104 -0.