psc41-11-29-07

psc41-11-29-07 - • Attrition • Diffusion of treatment...

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1 Validity • Statistical Validity • Construct Validity • External Validity – Ecological Validity • Internal Validity Major Confounding Variables • Maturation • History • Testing • Instrumentation • Regression to the mean • Selection
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Unformatted text preview: • Attrition • Diffusion of treatment • Sequence effects Other Threats to Validity • Subject Effects – Demand Characteristics – Placebo Effect • Experimenter Effects – Experimenter expectancies...
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