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| Validity | 2 |
| Attrition (Research Studies) | 1 |
| Behavior Patterns | 1 |
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| Evaluation and Program… | 2 |
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| Corrigan, Patrick W. | 1 |
| Cronan, Terry A. | 1 |
| Lyons, Heather W. | 1 |
| Matt, Georg E. | 1 |
| Salzer, Mark S. | 1 |
| Sarkin, Andrew J. | 1 |
| Tally, Steven R. | 1 |
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| Reports - Evaluative | 1 |
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The Conflict between Random Assignment and Treatment Preference: Implications for Internal Validity.
Peer reviewedCorrigan, Patrick W.; Salzer, Mark S. – Evaluation and Program Planning, 2003
Agrees with the power of randomized clinical trials, but makes the case that random assignment raises other, unanticipated threats to internal validity as a result of failing to consider treatment preference in research participant behavior. Reviews benefits and limitations of research strategies that augment randomization while respecting…
Descriptors: Behavior Patterns, Participation, Research Methodology, Research Problems
Peer reviewedSarkin, Andrew J.; Tally, Steven R.; Cronan, Terry A.; Matt, Georg E.; Lyons, Heather W. – Evaluation and Program Planning, 1997
A strategy proposed by T. Cook and D. Campbell (1979) was used to investigate attrition in a community-based literacy program, focusing on 287 Head Start families. Data revealed interactions among intervention program-centered characteristics and person-centered characteristics that have implications for study validity and generalizability.…
Descriptors: Attrition (Research Studies), Community Programs, Dropouts, Generalization
