Dear all,
In Pinheiro and bates'book, we fit an ARMA(1,1) model with:
>fm5Ovar.lme<-update(fm1Ovar.lme,corr=corARMA(p=1,q=1)
But the result is:
Error in "coef<-.corARMA"(*tmp*, value = c(62.3428455940029,
95.0395441938099, :
Coefficient matrix not invertible
There is also problems when we fit an exponential spatial correlation
model for the within-group error:
fm3BW.lme<-update(fm2BW.lme,corr=corExp(form=~Time))
We obtain:
Error in recalc.corSpatial(object[[i]], conLin) :
NA/NaN/Inf in foreign function call (arg 1)
I would be grateful if anyone could help me.
Cordially,
Martin Ludovic.
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