Dear all it's me again Intrinsic hypothesis is different from second order one mainly because in the first case covariance function does not exist and variogram is computed instead of it.... My question is... How to realize about non stationarity of my variable?... ok...I can take a look at the shape of my variogram...if it is bounded, variable is stationary, while if it continue increasing with lag variable is non stationary and I need some non stationarity methodology to treat it.... The problem is how to realize about the intrinsicness of my variable...what does "covariance does not exist" mean?...I can calculate covariance with ISATIS and when variogram increases not bounding around a priori variance my covariance will be negative...but it continue to exist!....so how to distinguish second order from intrinsic variables?....and decide if beeing able to use only variogram or choose between covariance or variogram?.... Ok...I could use variogram not worring about the kind of stationarity of my variable, but I want to know which kind of theory I'm appling on my dataset.. Thanks Simone
----------------------------- Dr. Simone Sammartino PhD student - Geostatistical analyst - G.I.S. mapping I.A.M.C. - C.N.R. Geomare-Sud section Port of Naples - Naples [EMAIL PROTECTED] ----------------------------- ____________________________________________________________ 6X velocizzare la tua navigazione a 56k? 6X Web Accelerator di Libero! Scaricalo su INTERNET GRATIS 6X http://www.libero.it
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