Ruda Zhang March 21, 2017:  Add quasi-newton methods [951ceba]
Ruda Zhang March 09, 2017:  Add notes on fitting. [647ee47]
Ruda Zhang March 09, 2017:  Link notes on interpolation [0455f48]
Ruda Zhang February 18, 2017:  GRASS commands; JOSM negative ID issue. [8ca9615]
Ruda Zhang September 11, 2016:  Completing linear regression model fitting and selection [2f04893]
Ruda Zhang June 26, 2016:  add category tag to wiki pages [a9b356c]
Ruda Zhang June 25, 2016:  use canonical filename and no internal H1 [eeca8ff]