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 (2)<br />
• Endogenous change<br />
• Other events (besides the treatment) occur between pretest and post-test<br />
• Test<strong>in</strong>g: see the Solomon 4 group design<br />
• Maturation<br />
• Regression <strong>to</strong>ward the mean<br />
• Signal <strong>to</strong> noise ratio<br />
• His<strong>to</strong>ry <strong>Effect</strong>s/External Events<br />
• Not problems <strong>in</strong> true experiments <strong>in</strong> which the context for both groups is the<br />
same<br />
SOCI 60: Lecture 16<br />
Benjam<strong>in</strong> Graham
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