Message-ID: <7FAA73D70AEE6B4BA5BE48F8BD97BC9A0267905046@HQEXDB02.hq.un.fao.org>
Date: 2011-09-01T12:41:14Z
From: Conchedda, Giulia (AGAL)
Subject: R-sig-Geo Digest, Vol 97, Issue 1
In-Reply-To: <mailman.17.1314871207.14711.r-sig-geo@r-project.org>
Hi to All,
My question concerns the best practice to compare cell-by-cell two grids that are representing the same phenomenon (distribution of rural poor). The grids have the same spatial extent and cell size and I would like to quantify and provide statistics on how pixel values in the two grids differ. I first subtracted one from the other and in this way I can already say and spot where differences are more frequent. What is the best statistics to quantify this difference?
Thanks for advising,
Giulia