Are the spatial correlation structures constructed in the ramps package
(e.g. corRMatern) exclusively compatible with georamps or is there also a
way of using them in nlme or is that just wishful thinking?  I would have
thought it possible since they are apparently the same class (corStruct),
but based on the result of this test (using spatial data from the ruf
package) I don't suppose the two are compatible....

library(nlme)
library(ruf)
data(d412)

d412$group=1

# Shuts down R in a heartbeat!
test=lme(ruf ~ CWED + IJI + NP + MSI, random=~1 | group,
correlation=corRMatern(form=~x+y, metric="euclidean"), data=d412)

Tyler

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