Robert, You're right about the questions to ask and the syrjala test is not appropriate for this purpose.
Thanks 2011/11/29 Robert J. Hijmans <[email protected]> > Mathieu, > > The syrjala test > http://rgm2.lab.nig.ac.jp/RGM2/func.php?rd_id=ecespa:syrjala is, like > other statistical tests, designed to estimate differences between > populations from samples. I do not think such tests are relevant in this > case as you do not have samples, you have the entire populations. Any > difference you find is therefore not an estimate, it is exactly what it is > (p=0 if you like). I think the question to ask in these cases is, how much, > and where, and how systematic, are the differences, and if the differences > are relevant for you (for your application). > > Robert > > > On Tue, Nov 29, 2011 at 7:09 AM, Mathieu Rajerison < > [email protected]> wrote: > >> Hi List, >> >> >> The GDEM ASTER SRTM V2 has been released not a long time ago. >> >> I'd like to test whether it would be convenient to derive Terrain >> Attributes from this Digital Elevation Model in a denoised version. >> >> To do that, I thought of comparing a reference paying digital terrain >> model >> from the French National Institute of Geography with this denoised GDEM. >> >> I thought of performing a syrjala test on these two data sources. Would >> you >> suggest other methods? >> >> >> Thanks, >> >> Mathieu >> >> [[alternative HTML version deleted]] >> >> _______________________________________________ >> R-sig-Geo mailing list >> [email protected] >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> > > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
