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
mchaudha@jhsph.edu <mailto:mchaudha@jhsph.edu> 

 


	[[alternative HTML version deleted]]


