
Contents
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15 The Co-Construction of Educational Reform: The Intersection of Federal, State, and Local Contexts
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17 The Youth Data Archive: Integrating Data to Assess Social Settings in a Societal Sector Framework
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Why Focus on Group Quality? Why Focus on Group Quality?
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The Importance of Reliability at the Group Level The Importance of Reliability at the Group Level
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Defining Reliability Defining Reliability
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Reliability and Statistical Power Reliability and Statistical Power
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Strategies for Increasing Reliability Strategies for Increasing Reliability
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Illustrative Example Illustrative Example
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Main Effects Main Effects
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Two-Way Interaction Effects Two-Way Interaction Effects
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Three-Way Interaction Three-Way Interaction
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Summary Summary
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Results Results
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Adding Raters Adding Raters
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Adding Dates Adding Dates
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Increasing Segments Increasing Segments
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Reliability, Sample Size, and Statistical Power Reliability, Sample Size, and Statistical Power
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Conclusions Conclusions
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Acknowledgments Acknowledgments
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Notes Notes
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References References
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18 Measuring and Improving Program Quality: Reliability and Statistical Power
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Published:June 2008
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Abstract
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.
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