On Fri, 27 Mar 2009 06:09:25 -0400, Peter Flom
>leah rubin <lhr1807@GMAIL.COM> wrote
>>We conducted a randomized clinical trial with 4 treatment groups (3
>>treatments and placebo) and baseline and 1-year.
>>Our primary interest was in examining differences in linear rates of
>>between each of the active treatment groups and the placebo group on
>>outcome measures from baseline to 1-year. I conducted a multilevel random
>>coefficient model and included a random intercept to account for
>>differences at baseline. Is this statistical method better than
>>ANCOVAs where the final score is the dependent measure and the baseline
>>value as the covariate? Any input and/or pertinent references to this
>>would be greatly appreciated.
>First, I am surprised the multilevel model worked with only two time
Perhaps Leah included patients nested in doctors or doctors nested in
clinics? More details of the study, including design, are usually very