A multiple group method of factoring the correlation matrix L. L. Thurstone OriginalPaper Pages: 73 - 78
The relation of item difficulty and inter-item correlation to test variance and reliability Harold Gulliksen OriginalPaper Pages: 79 - 91
Factor analysis calculations by tabulating machines D. M. HallE. L. WelkerIsabelle Crawford OriginalPaper Pages: 93 - 125
Factorial design and covariance in the study of individual educational development Palmer O. JohnsonFei Tsao OriginalPaper Pages: 133 - 162