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Ligtvoet, Rudy, Ark, L. Andries, Bergsma, Wicher P. 
ORCID: 0000-0002-2422-2359 and Sijtsma, Klaas
(2011)
Polytomous latent scales for the investigation of the ordering of items.
Psychometrika, 76 (2).
pp. 200-216.
ISSN 0033-3123
Ark, L. Andries and Bergsma, Wicher P. ORCID: 0000-0002-2422-2359
(2010)
A note on stochastic ordering of the latent trait using the sum of polytomous item scores.
Psychometrika, 75 (2).
pp. 272-279.
ISSN 0033-3123
