Threats to Validity in Experiments The John Henry Effect
Threats to Validity in Experiments The John Henry Effect
Threats to Validity in Experiments The John Henry Effect
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<strong>Threats</strong> <strong>to</strong> <strong>in</strong>ternal validity <strong>in</strong> experiments (3)<br />
• Contam<strong>in</strong>ation effects:<br />
• Diffusion<br />
• Particularly problematic where the treatment is some form of<br />
<strong>in</strong>formation or education<br />
• Demoralization<br />
• Compensa<strong>to</strong>ry rivalry: AKA the <strong>John</strong> <strong>Henry</strong> <strong>Effect</strong><br />
SOCI 60: Lecture 16<br />
Benjam<strong>in</strong> Graham
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