Dear All:
lme(sbp ~ cengirth, data = family, random= ~ 1 | familyid) converges but lme(sbp ~ cengirth, data = family, random= ~ cengirth | familyid) does not. I get the following message: Error in lme.formula(sbp ~ cengirth, data = family, random = ~cengirth | : iteration limit reached without convergence (9) The data has 488 rows and 154 familyid levels. For some familyid levels, there is only one row and cengirth is 0 as it is a centered variable within familyid. I appreciate your pointing me to the source of the problem. Ashraf _________________________________ M. Ashraf Chaudhary, Ph.D. Department of International Health Johns Hopkins Bloomberg School of Public Health 615 N. Wolfe St. Room W5506 Baltimore MD 21205-2179 (410) 502-0741/fax: (410) 502-6733 [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html