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RMA 2

Dimensionality and Scaling

QuestionAnswer
What is a dimension in personality psychology? It refers to a continuum on which an individual can have various levels of a trait.
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?
What is unidimensionality? The property of a test where the test items reflect only one psychological dimension.
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.
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.
What is multidimensionality? The property of a test where the test items reflect more than one psychological dimension.
What are some examples of multidimensional tests with correlated dimensions? The Weschler Intelligence Scale for Children (WISC-IV) and the Stanford-Binet (SB5)
How do standard multidimensional tests with correlated dimensions group questions? They have groups of questions that assess different psychological attributes called subtests.
What are subtests? groups of questions that assess different psychological attributes in multidimenional tests with correlated dimensions
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
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.
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.
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.
What is an example of multidimensional tests with uncorrelated dimensions (MTUD)? The NEO Five Factor Inventory, or NEO-FFI.
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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