"I should point out that a number of factor analytic studies of Piagetian tests along with other measures commit an egregious psychological error by orthogonally rotating the factors (or principal components) by some method such as varimax, which prohibits the emergence of the large general factor in all such tests.
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"I used improper factor analysis, and now…
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"I should point out that a number of factor analytic studies of Piagetian tests along with other measures commit an egregious psychological error by orthogonally rotating the factors (or principal components) by some method such as varimax, which prohibits the emergence of the large general factor in all such tests.