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  • Ligtvoet, R. & Vermunt, J. K. (2012). Latent class models for testing monotonicity and invariant item ordering for polytomous items. British Journal of Mathematical and Statistical Psychology, 65, 237-250.
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  • Ligtvoet, R., Van der Ark, L. A., & Sijtsma, K. (2008). Selection of Alzheimer symptom items with manifest monotonicity and manifest invariant item ordering. In K. Shigemasu, A. Okada, T. Imaizumi, & T. Hoshino (Eds.), New trends in psychometrics (pp. 225-234). Tokyo: Universal Academy Press.

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