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st: Power Analysis in 2-Level Hierarchical Linear Model

From   Anthony Fulginiti <>
Subject   st: Power Analysis in 2-Level Hierarchical Linear Model
Date   Mon, 15 Apr 2013 23:04:22 -0700 (PDT)

Hello Statalist,

I have enjoyed following the creative and informative insights and guidance on Statalist over the past few months. 

I am interested in performing a power analysis in a 2-level hierarchical linear model (more specifically, a growth curve model).  

Let's use the example of 80 clusters (individuals) with 10 per cluster (observations). If it is helpful, the code for the model is: 

xtmixed Self-Esteem time time2 Program ProgramBytime ProgramBytime2|| id: time, covariance(un) variance mle

I ran a basic search in the Statalist archives and searched for power analysis options in Stata but did not find any information on the subject for hierarchical linear models. I have been reviewing material that recommends the use of Optimal Design software or PinT (Power in Two-level Designs) for power analysis in hierarchical linear modeling.  However, I have a Mac and both programs seem to run on Windows (my Windows platform has been giving me problems).  

Is it possible to perform a power analysis with a 2-level hierarchical linear model in Stata? 

If not, I would welcome any further recommendations for performing the analysis.

Thanks in advance for feedback.  

Respectfully, Anthony

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