Displaying 3 results from an estimated 3 matches for "sphercov".
2004 Oct 31
3
strange results with dmvnorm
...en calculate a covariance matrix using
a spherical correlation function. Then with certain combinations of
range and sill parameters dmvnorm is returning values greater than 1. Surely
the results of dmvnorm should be in the interval 0:1 (or do I just nead a
holiday?). In addition cov.spatial and sphercov are giving different results.
Any clues as to what is happening here might just save my sanity.
Many Thanks
David
x <-
c(22038,50284,56009,46979,21417,10149,31305,34473,42883,55084,51097,67990,55710,20256,31972,46423,20321,70886
,18758,43727,23834,13612,70217,38389,7980,41711,19462,35191,1392...
2002 Apr 03
3
non-stationary covariance
...questions:
1) which is in R the function to make a covariogram of spatial data ?
2) does anyone know if there exist the possibility in R of performing
kriging with an arbitrary covariance function ?
If I have well understood the Krig procedure offers only three
possibilities (expcov, gauscov and sphercov) that are the common models
for stationary and isotropic processes.
Thanks,
Paola.
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2006 Nov 01
1
How to find further informations on specific options?
Dear friends,
When i read the R-help , i often find the following case:
e.g.:surf.gls(np, covmod, x, y, z, nx = 1000, ...) #Package Spatial:
Arguments:
covmod: function to evaluate covariance or correlation function
* ...: parameters for 'covmod'*
How should i find the further information on "*...: parameters for 'covmod'*" ?
I use the ?covmod, but