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]>
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