Olsson, U. (1979). Maximun Likelihood Estimation of the Polychoric Correlation. Psychometrika, 44(4), 443-460.
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Olsson, U. 1979: Maxlmum llkelihood estlmation o f the polychoric correlation coefflclent. Psy- chometrika 44: 443-460.
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Poon, W. Y., & Lee, S. Y. (1987). Maximum likelihood estimation of multivariate polyserial and polychoric correlation coefficients. Psychometrika, 52, 409-430.
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Olsson, U., Lee, S. Y. (1979). Maximum likelihood estimation of multivariate polyserial and polychoric correlation coefficients. Psy- chometrika, 44(4), pp. 443-460.
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