“The Bi-Factor Method”, 1937-03-01 (; backlinks; similar):
The Bi-factor Method of factor analysis is described and illustrated with a small group of 14 tests. A detailed illustration is given of how the method may be modified to the case of overlapping group factors.
It is advocated that the Bi-factor pattern in unmodified form be used to determine the adequacy of tests for the measurement of unitary traits. [see also 2021]
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