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From |
Jeph Herrin <stata@spandrel.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Power Analysis in 2-Level Hierarchical Linear Model |

Date |
Tue, 16 Apr 2013 09:09:32 -0400 |

I am often called upon to do power calculations for 2 and 3 level HLMs. There are two approaches I usually use:

hope this helps, Jeph On 4/16/2013 2:04 AM, Anthony Fulginiti wrote:

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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Power Analysis in 2-Level Hierarchical Linear Model***From:*Anthony Fulginiti <fulginitipsy@yahoo.com>

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