The position effect in a Rasch-homogenous test: A fixed-links modeling approach.

Thomas, Philipp; Rammsayer, Thomas H.; Schweizer, Karl; Troche, Stefan J. (23 July 2015). The position effect in a Rasch-homogenous test: A fixed-links modeling approach. (Unpublished). In: 13th European Conference on Psychological Assessment. Zürich. 22.07.-25.07.2015.

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The position effect describes the influence of just-completed items in a psychological scale on subsequent items. This effect has been repeatedly reported for psychometric reasoning scales and is assumed to reflect implicit learning during testing. One way to identify the position effect is fixed-links modeling. With this approach, two latent variables are derived from the test items. Factor loadings of one latent variable are fixed to 1 for all items to represent ability-related variance. Factor loadings on the second latent variable increase from the first to the last item describing the position effect. Previous studies using fixed-links modeling on the position effect investigated reasoning scales constructed in accordance with classical test theory (e.g., Raven’s Progressive Matrices) but, to the best of our knowledge, no Rasch-scaled tests. These tests, however, meet stronger requirements on item homogeneity. In the present study, therefore, we will analyze data from 239 participants who have completed the Rasch-scaled Viennese Matrices Test (VMT). Applying a fixed-links modeling approach, we will test whether a position effect can be depicted as a latent variable and separated from a latent variable representing basic reasoning ability. The results have implications for the assumption of homogeneity in Rasch-homogeneous tests.

Item Type:

Conference or Workshop Item (Paper)


07 Faculty of Human Sciences > Institute of Psychology
07 Faculty of Human Sciences > Institute of Psychology > Personality Psychology, Differential Psychology and Diagnostics

UniBE Contributor:

Thomas, Philipp; Rammsayer, Thomas and Troche, Stefan


100 Philosophy > 150 Psychology
300 Social sciences, sociology & anthropology > 370 Education




Karin Dubler

Date Deposited:

19 May 2016 10:52

Last Modified:

08 Mar 2019 08:05


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