sill not reaching 1 in a climatological variogram
Subash, We would only expect the sample variogram to be on the variogram model line when (a) we had an infinite number of observations, taken over (b) an infinitely large domain. As we don't have this in practice, sample variogram points vary around the theoretical line. As these sample variogram points are correlated, their fluctuation often does not look like random fluctuation -- you described this as "a dip [...] at 50 km" in your original mail.
On 05/03/2013 05:38 PM, subash wrote:
Thanks Edzer for the prompt reply. Can you please elaborate on the answer two my 2 question. I could understand "consecutive sample variogram estimates are dependent as they share the same observations when forming pairs." I am aware that the same observation are used when forming pairs but how that would lead to the dip in the variogram. Regards, Subash -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/sill-not-reaching-1-in-a-climatological-variogram-tp7583465p7583478.html Sent from the R-sig-geo mailing list archive at Nabble.com.
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Edzer Pebesma Institute for Geoinformatics (ifgi), University of M?nster Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251 83 33081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de