Is the Factor Observed in Investigations on the Item-Position Effect Actually the Difficulty Factor?

Schweizer, Karl; Troche, Stefan (2018). Is the Factor Observed in Investigations on the Item-Position Effect Actually the Difficulty Factor? Educational and psychological measurement, 78(1), pp. 46-69. SAGE 10.1177/0013164416670711

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In confirmatory factor analysis quite similar models of measurement serve the detection of the difficulty factor and the factor due to the item-position effect. The item-position effect refers to the increasing dependency among the responses to successively presented items of a test whereas the difficulty factor is ascribed to the wide range of item difficulties. The similarity of the models of measurement hampers the dissociation of these factors. Since the item-position effect should theoretically be independent of the item difficulties, the statistical ex post manipulation of the difficulties should enable the discrimination of the two types of factors. This method was investigated in two studies. In the first study, Advanced Progressive Matrices (APM) data of 300 participants were investigated. As expected, the factor thought to be due to the item-position effect was observed. In the second study, using data simulated to show the major characteristics of the APM data, the wide range of items with various difficulties was set to zero to reduce the likelihood of detecting the difficulty factor. Despite this reduction, however, the factor now identified as item-position factor, was observed in virtually all simulated datasets.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Troche, Stefan

Subjects:

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

ISSN:

0013-1644

Publisher:

SAGE

Language:

English

Submitter:

Karin Dubler

Date Deposited:

30 Apr 2019 14:49

Last Modified:

22 Oct 2019 21:01

Publisher DOI:

10.1177/0013164416670711

BORIS DOI:

10.7892/boris.127847

URI:

https://boris.unibe.ch/id/eprint/127847

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