Hi,



I am learning R. I am using nlme function to my dataset. I am getting error
"Coefficient matrix not invertible". I don't know how to fix this problem.



> bcows1.nlme<-nlme(Temp~model(newTime, beta, delta, kappa), data=
bcows.group,

+              fixed=beta+delta+kappa~1,

+              random=beta+delta+kappa~1,

+              start=list(fixed=c(coef(bcows.nls)[1], coef(bcows.nls)[2],
coef(bcows.nls)[3])))

> bcows2.nlme<-update(bcows1.nlme, correlation=corARMA(p=2))

Error in "coef<-.corARMA"(`*tmp*`, value = c(210.907034244201,
197.591708911204 :

        Coefficient matrix not invertible

>



Please anyone could tell me how to fix this problem.





Thanks

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