[R-sig-ME] lme with ECLS

[Roberts, Kyle]

Friends,

I am running the ECLS dataset with lme (long story on why I couldn't use lmer; mostly political) and am having trouble.  Here's the model:

m.null<-lme(MATH~TIME, random=~TIME|CHILDID, ecls, na.action=na.omit, weights=varFixed(~C1_6SC0))

When I ran the model without the weighting variable, it converged in about a minute (~17000 kids on 4 measurement occasions). But with the weights the thing has been running for about 24 hours without coming to a solution.

Any ideas????

R 2.7.1
HP workstation with 4G RAM, Windows XP

Thanks,
Kyle


*********************************************************
Dr. J. Kyle Roberts
Department of Literacy, Language, and Learning
School of Education and Human Development
Southern Methodist University
P.O. Box 750381
Dallas, TX  75275
214-768-4494
http://www.hlm-online.com/