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| Bias | 1 |
| Drug Rehabilitation | 1 |
| Evaluation Problems | 1 |
| Experiments | 1 |
| Outcomes of Treatment | 1 |
| Pretests Posttests | 1 |
| Research Problems | 1 |
| Self Evaluation (Individuals) | 1 |
| Validity | 1 |
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| Evaluation Review | 1 |
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| Aiken, Leona S. | 1 |
| West, Stephen G. | 1 |
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| Journal Articles | 1 |
| Reports - Evaluative | 1 |
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Peer reviewedAiken, Leona S.; West, Stephen G. – Evaluation Review, 1990
The validity of true experiments is threatened by a class of self-report biases that affect all respondents at pretest, but which are diminished by treatment. Four of these inaccurate self-evaluation biases are discussed. Means of detection include external criteria, special conditions of measurement, and retrospective pretests. (TJH)
Descriptors: Bias, Drug Rehabilitation, Evaluation Problems, Experiments
