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5.
Jöreskog, K. G., Gruvaeus, G. T., and van Thillo, M.ACOVS, a general computer program for analysis of covariance structures . Research Bulletin 70-15, Princeton, N. J.: Educational Testing Service, 1970. (b)
6.
Lord, F. M. and Novick, M. R.Statistical theories of mental test scores. New York: Addison & Wesley, 1968.
