Re: singularity problem

[Edzer J. Pebesma]

Miha STAUT wrote:

Time ago I posted a problem about a singularity problem which I 
suspected was due to duplicate data. Well mr. Pebsma gave me a hint 
on the new functionality of gstat-R (zerodist) which would eliminate 
the redundant points. But as usually there was a problem. The new 
function did not find any duplicate points. I was doing an ordinary 
krigging with around 3500 points on a 900 by 600 grid. Any idea?


Did you use a Gaussian variogram model?
--
Edzer


No I used the matern model, but I can try to fit a gaussian model or 
some other model nested into a gaussian model, if you think this could 
be the solution.
Miha, the Matern model is a family rather than a model, as it includes
the Gaussian and exponential variograms as special cases. The
smoothness parameters determines this -- which value did you use?
Does it help if you add a (small) nugget to the variogram?
--
Edzer