Chapter 7 Lecture - Part 4 Design Chapter 7 Design...

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Copyright Atomic Dog Publishing, 2005 Part 4 Design Chapter 7 Design
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Copyright Atomic Dog Publishing, 2005 Design Used to structure the research To show how all the major parts of the research project work together to address the question Most related to assessing cause-effect questions Closely connected to internal validity
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Copyright Atomic Dog Publishing, 2005 Internal Validity “The approximate truth about inferences regarding cause-effect ( causal ) relationships” (Cook & Campbell,1979) The primary consideration in establishing cause and effect Key question: Can observed changes (effect) be attributed to the program or intervention (cause) and not some other possible (alternative) cause? Only relevant to the specific study in question (i.e., is not concerned with generalizability)
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Copyright Atomic Dog Publishing, 2005 A Schematic View of the Conceptual Context for Internal Validity
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Copyright Atomic Dog Publishing, 2005 Internal Validity Establishing Cause and Effect Temporal precedence The cause happens before the effect Covariation of the cause and effect If cause, then effect; if not cause, then not effect No plausible alternative explanations “third variable problem” Internal validity is the extent to which plausible alternative explanations have been ruled out.
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Copyright Atomic Dog Publishing, 2005 In Typical Outcome Evaluation. .. Is taken care of because you intervene before you measure the outcome Is taken care of because you control the intervention Is the central issue of internal validity—usually taken care of through your design Temporal precedence Covariation of cause and effect No alternative explanations
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Copyright Atomic Dog Publishing, 2005 Single-Group Threats to Internal Validity
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Copyright Atomic Dog Publishing, 2005 Threats to Internal Validity Single Group Threats History Maturation Testing Instrumentation Mortality Regression
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Copyright Atomic Dog Publishing, 2005
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This note was uploaded on 02/11/2011 for the course CHFD 5110 taught by Professor Johnson during the Spring '11 term at University of Georgia Athens.

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Chapter 7 Lecture - Part 4 Design Chapter 7 Design...

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