zhongmiao wang <zhongmiao <at> gmail.com> writes: > > I keep getting the error message "Error in lme.formula(fixed = Score ~ > factor(time) - 1, data = ldata, random = list(dumid = mat), : > iteration limit reached without convergence (9)" > Is there a way to set up starting values, especially the starting > values for the variance covariance of random effect? Thanks in > advance!
For models that simple in the fixed part, lme is rather robust when the random part is correctly specified. Using starting value IS important in nlme, but in this case I assume that your externally computed "mat" is ill-conditioned. Did you try one of the supplied versions (e.g. pdDiag(~....)) first? These cover quite a large ground, and if you are not, better try these first. Dieter ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
