[R-sig-ME] Hi listers

Said Ali Shah @@id_lect06 @ending from y@hoo@com
Thu May 10 09:08:26 CEST 2018

I am using linear mixed model for my analysis, my model is m1<-lme(yij~X1i+Tti+X1i*Tti+(1+Tti),data1)  with random slope and random intercept. if i run this model it works fine but when i run it in loop or i specify correlation structure i.e.m<-lme(yij~X1i+Tti+X1i*Tti+(1+Tti),correlation=corAR1(), data1) then it give me error Error in lme.formula(yij ~ X1i + Tti + X1i * Tti + (1 + Tti), correlation = corAR1(),  :   nlminb problem, convergence error code = 1  message = iteration limit reached without convergence (10)so whether there is problem in model specification or in the correlation specification? 
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