Dimensionality and Scaling
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| What is a dimension in personality psychology? | It refers to a continuum on which an individual can have various levels of a trait.
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| What are the three core questions regarding a test's dimensionality? | 1. How many dimensions are reflected in the test items?
2. If a test has more than one dimension, are those dimensions correlated with each other?
3. If a test has more than one dimension, what are those dimensions?
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| What is unidimensionality? | The property of a test where the test items reflect only one psychological dimension.
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| What is conceptual homogeneity? | The property of test items whereby the responses to each test item would be a function or measure of the same psychological attribute.
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| How are scores computed in unidimensional tests? | Only a single score is computed, which reflects the single psychological attribute measured by the test. All the items are combined in some way to form a composite or "total" score.
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| What is multidimensionality? | The property of a test where the test items reflect more than one psychological dimension.
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| What are some examples of multidimensional tests with correlated dimensions? | The Weschler Intelligence Scale for Children (WISC-IV) and the Stanford-Binet (SB5)
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| How do standard multidimensional tests with correlated dimensions group questions? | They have groups of questions that assess different psychological attributes called subtests.
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| What are subtests? | groups of questions that assess different psychological attributes in multidimenional tests with correlated dimensions
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| In the SB5, how are questions ordered? | Each subtest, proven to correlate positively with each other, measures a different facet of intelligence.
1. Fluid Reasoning
2. General Knowledge
3. Quantitative processing ability
4. Visual-Spatial processing ability
5. Working memory
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| How are scores in multidimensional tests with correlated dimensions scored? | Since each subtest is unidimensional and the questions in each subtest are conceptually homogeneous, each subtest produce its own score. These scores are then combined to produce a total test score.
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| What is a higher-order factor in multidimensional tests with correlated dimensions? (MTCD) | They are a factor that is at a more general level than the specific factors or attributes.
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| What is the difference between unidimensional tests and MTCDs? | Unidimensional tests only need to have their one composite score psychometrically evaluated. In MTCDs, each subtest in addition to the composite score needs to be evaluated.
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| What is an example of multidimensional tests with uncorrelated dimensions (MTUD)? | The NEO Five Factor Inventory, or NEO-FFI.
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| How are scores in MTUDs calculated? | A score is obtained for each subtest, but these scores are not combined. Also, each of these scores are evaluated seperately for psychometric quality.
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