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Page history last edited by PBworks 17 years, 10 months ago
Design
Threats to Internal Validity
Threats to External Validity
One-shot case studyHistory, maturation, selection, and mortalityInteraction of selection and X
One group pretest-posttest designHistory, maturation, testing, instrumentation, interaction of selection and other factorsInteraction of testing and X. Interaction of selection and X.
Time-series designHistoryInteraction of testing and X
Pretest-posttest Control-group designNone (mortality according to Dr. Bass)Interaction of testing and X
Posttest-only Control-group designMortalityNone
Solomon-four group designNone (mortality according to Dr. Bass)None

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