IMMEDIATE RELEASE

College Park, MD - April 28, 2010 - The Institute of Educations Sciences (IES) at the U.S. Department of Education contracted with Optimal Solutions Group, LLC to develop a guide for calculating statistical power for complex multilevel designs that are used in most field studies in education.

On its website, the National Center for Special Education Research has released a paper entitled "Statistical Power Analysis in Education Research," coauthored by Larry Hedges and Christopher Rhoads. This paper provides a guide to calculating statistical power for the complex multilevel designs that are used in most field studies in education research. To view the report, please visit: http://ies.ed.gov/ncser/pubs/20103006/.

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Founded in 2000, Optimal Solutions Group, LLC is a non-partisan public policy research firm dedicated to rigorous and evidence-based research. Optimal's clients are local, state, and federal governments; non-governmental organizations; and corporations and foundations. Located in the M Square Research Park, Optimal has grown quickly by building on a reputation of exceptional services and products. Our clients benefit from our innovations, value, and efficiency, which we have been able to establish through a robust technology-based infrastructure, uncompromising and documented quality-control procedures, and effective employee recruitment techniques. Optimal has four research centers: health, education, workforce development, and housing.

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