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standarized
2012 Nov 20
0
Multilevel analysis using nlme (lme) . Error using z-scores
Hi,
i am trying to learn something about multilevel analysis using a great
"Discovering statistics using R". I constructed some sample data and then
tried to fit a model. Generally model fits well, however when trying to fit
the same model using z-score (standarizded) variables i got an error:
Error in lme.formula(z_wyn ~ z_IQ + Kasa, data = la, random = ~z_IQ | :
nlminb problem, convergence error code = 1
message = iteration limit reached without convergence (10)
Below i attach all the code required to reproduce. My question is : is it a
bug or a fe...