[Gstat-info] missing values and duplicates in gstat for R
uleopold at science.uva.nl
Fri Feb 29 16:40:35 CET 2008
I am having some problems with dealing with missing values in gstat computing
I am using R 2.6.2, sp 0.9-19 and gstat 0.9-43 on Ubuntu Linux 7.10.
I get the follwoing error message:
> variogram(sand ~1, soilcore_nodup.tmp)
Error: dimensions do not match: locations 374 and data 184
This message occurs due to 187 x,y coordinate pairs and 184 values for the
variable sand. I think the locations information is not correct as divided by
2 it would give the real number of locations (= 187 not 374).
Nevertheless, I do not know how to handle the 3 missing values from variable
"sand" (187-184) in order to compute a semivariogram. Is there a function like
"na.rm=TRUE" or "na.omit()" I could use?
Another question is how can I rather average duplicates than removing them?
Thanks for any suggestions or comments,
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