Abstract
The construct validity of the Matrix Analogies Test-Expanded Form (MAT-EF; Naglieri, 1985a, 1985b) was examined for two groups of children (n = 455 and n = 373). For each group, tetrachoric correlations were calculated from item scores and then factor analyzed to determine (a) if support exists for organization of items into item groups and (b) if the total test represents a general measure of nonverbal reasoning ability Results revealed support for the organization of items into specific groups identified as Pattern Completion, Serial Reasoning, and Spatial Visualization. More importantly, most items (including items in a second item group: Reasoning by Analogy) received a high loading on the first unrotated factor extracted, providing construct validity support for the MAT-EF as an overall measure of nonverbal reasoning ability.
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