[GRASSLIST:5820] Re: linear regression of 2 rasters

[Hamish]

> Is there any simple way in GRASS to do a linear regression of 2 raster
> files, or would I need to first subsample with vector points?


GRASS 6.0beta2 > r.regression.line --help

Description:
 Calculates linear regression from two raster maps: y = a + b*x

Usage:
 r.regression.line map1=name map2=name [output=name]

Parameters:
    map1   Map for x coefficient
    map2   Map for y coefficient
  output   ASCII file for storing regression coefficients (output to
           screen if file not specified).


or maybe r.covar?




Hamish