st: Question about XTMIXED command

[Christina Wei <christinaw1211@gmail.com>]

Hi all,

I am using Stata version 12.  New to data analysis using the long format.

My question is:  I am trying to do a multilevel data analysis involving
data collected from 100 patients over 3 visits.  I would like to adjust for
baseline BMI, but in the long format BMI is collected over 3 visits and BMI
from all 3 visits look like they will appear in the model if I were to
insert it into the command as followed:

xtmixed y i.female bmi age  || unqid:year, covariance(unstructured)  ||
bmi:year,covariance(unstructured)

How can I include baseline BMI (visit 1) as the variable that I would like
to add to the model?

Thanks for your help,
Christina
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