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28 Cards in this Set
- Front
- Back
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Advantages of Experiemental Designs |
examine causal relationshps and deliberate manipulation of IV (treatment)
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Requirements for Causality inference
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2 variables must be correlated, proper time order must be established, there should be no confounding or extraneous variables
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Causal Inference |
when changes in one variable (IV - treatment) affect changes in another variable (DV - outcome meausre), we say that the IV causes the effect in the DV.
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One-group post-test only design
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R T O - random assignment of subjects to experiment, treatment given, then measurement of DV
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Post-test only control group design
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R T O | R C O - adding control or comparison groups - one factor study
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pretest - post-test control group design
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R O T O | R O C O - adding a pretest
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Randomized Solomon four-gorup design |
R O T O | R O C O | R _ T O | R _ C O (Only two groups receive a pretest)
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What does an interaction indicate?
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That a variable influences the magnitude of the treatment effect
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What are crossed factors?
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Every level of a factor occurs in combination with every level of another factor
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What are nested factors?
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Levels of a factor occur in only one level of another factor.
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Cross-sectional Design
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measurements collected at a single point in time
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Longitudinal Study |
multiple measurements collected over time - allows subjects to serve as their own controls
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Disaggregation
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analyze data at lowest level
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Aggregation
|
Determine lowest level at which observations are indpendent, summarize scores below this level |
|
|
Advantages of Experiemental Designs
|
examine causal relationshps and deliberate manipulation of IV (treatment)
|
|
|
Requirements for Causality inference
|
2 variables must be correlated, proper time order must be established, there should be no confounding or extraneous variables
|
|
|
Causal Inference
|
when changes in one variable (IV - treatment) affect changes in another variable (DV - outcome meausre), we say that the IV causes the effect in the DV.
|
|
|
One-group post-test only design
|
R T O - random assignment of subjects to experiment, treatment given, then measurement of DV
|
|
|
Post-test only control group design
|
R T O | R C O - adding control or comparison groups - one factor study
|
|
|
pretest - post-test control group design
|
R O T O | R O C O - adding a pretest
|
|
|
Randomized Solomon four-gorup design
|
R O T O | R O C O | R _ T O | R _ C O (Only two groups receive a pretest)
|
|
|
What does an interaction indicate?
|
That a variable influences the magnitude of the treatment effect
|
|
|
What are crossed factors?
|
Every level of a factor occurs in combination with every level of another factor
|
|
|
What are nested factors?
|
Levels of a factor occur in only one level of another factor.
|
|
|
Cross-sectional Design
|
measurements collected at a single point in time
|
|
|
Longitudinal Study
|
multiple measurements collected over time - allows subjects to serve as their own controls
|
|
|
Disaggregation
|
analyze data at lowest level
|
|
|
Aggregation
|
Determine lowest level at which observations are indpendent, summarize scores below this level |
