When Programs Benefit Some People More than Others: Tests of Differential Service Effectiveness
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- Macias, C., Jones, D.R., Hargreaves, W.A. et al. Adm Policy Ment Health (2008) 35: 283. doi:10.1007/s10488-008-0174-y
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Practitioners need to know for whom evidence-based services are most or least effective, but few services research studies provide this information. Using data from a randomized controlled comparison of supported employment findings for two multi-service psychiatric rehabilitation programs, we illustrate and compare procedures for measuring program-by-client characteristic interactions depicting differential program effectiveness, and then illustrate how a significant program-by-client interaction can explain overall program differences in service effectiveness. Interaction analyses based on cluster analysis-identified sample subgroups appear to provide statistically powerful and meaningful hypothesis tests that can aid in the interpretation of main effect findings and help to refine program theory.