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level 1 variance-covariance structure

Thank you Andrew,
But it doesn't work, I get the same error:

  m3a <- lme(attit ~ 1 +  age13 , data=data, random= ~ age13  | id, 
correlation = corAR1(, form =  ~ ind | id), 
control=list(msMaxEval=10000, maxIter=10000, msMaxIter=10000, 
niterEM=10000))
Error in lme.formula(attit ~ 1 + age13, data = data, random = ~age13 |  :
   nlminb problem, convergence error code = 1
   message = singular convergence (7)
On 4/12/2011 2:05 PM, Andrew Robinson wrote: