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Toward Positive Youth DevelopmentTransforming Schools and Community Programs$
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Marybeth Shinn and Hirokazu Yoshikawa

Print publication date: 2008

Print ISBN-13: 9780195327892

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780195327892.001.0001

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Measuring and Improving Program Quality: Reliability and Statistical Power

Measuring and Improving Program Quality: Reliability and Statistical Power

Chapter:
(p.333) Chapter 18 Measuring and Improving Program Quality: Reliability and Statistical Power
Source:
Toward Positive Youth Development
Author(s):

Andres Martinez

Stephen W. Raudenbush

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195327892.003.0018

Many youth development programs are designed to improve youth outcomes by improving the quality of social interactions occurring in classrooms, athletic teams, therapy groups, after-school programs, recreation centers, or other group settings. In evaluating such programs, it becomes essential to assess the impact of the program on the “group quality,”; that is, the quality of the social interactions that occur in such group settings. It follows that the reliable measurement of group quality becomes important to the success of the evaluation. Low reliability will weaken the statistical power of the evaluation to detect program effects on group quality. This chapter introduces how to assess the reliability of measures of group quality and how to design evaluation studies that have adequate statistical power to detect impacts on group quality.

Keywords:   measurement, reliability, group quality, statistical power, ecometrics, program evaluation

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