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| Research Methodology | 2 |
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| Drug Rehabilitation | 1 |
| Error of Measurement | 1 |
| Evaluation Problems | 1 |
| Experiments | 1 |
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| Dennis, Michael L. | 2 |
| Lennox, Richard D. | 1 |
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| Journal Articles | 2 |
| Reports - Evaluative | 2 |
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Peer reviewedDennis, Michael L. – Evaluation Review, 1990
Six potential problems with the use of randomized experiments to evaluate programs in the field are addressed. Problems include treatment dilution, treatment contamination or confounding, inaccurate case flow and power estimates, violations of the random assignment processes, changes in the environmental context, and changes in the treatment…
Descriptors: Drug Rehabilitation, Evaluation Problems, Experiments, Field Studies
Peer reviewedLennox, Richard D.; Dennis, Michael L. – Evaluation and Program Planning, 1994
Potential methods are explored for removing or otherwise controlling random measurement error, assessment artifacts, irrelevant variation in outcome measures, and confounding sources of covariation in a structural equations model. Using examples with measures of quality of life and functioning, the authors consider these methods for field…
Descriptors: Error of Measurement, Field Studies, Measurement Techniques, Models
