
I already ran a mixed model and got convergence.  I have 700 data points.  Now, I am running a new mixed model that adds the ARMA (corARMA) covariance pattern.  I keep getting an error message telling me that the model did not reach convergence.  I already tried reducing my tolerance to 1e-1 and increased the number of iterations to 7,000.  Still, I am not having any luck.  
 
Any suggestions to get my model to work properly so I can get my parameter estimates?  I pasted my covariance code below.  
 
LVB2.nlme<-update(LVB.nlme, corr=corARMA(p=1, q=1), 
control=nlmeControl(maxIter=6000, tolerance=1e-1, msVerbose=TRUE))
 
Mike
  		 	   		  
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