Problems with the factor analysis of items: solutions based on item response theory and item parcelling.

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dc.contributor.author De Bruin, G.P.
dc.date.accessioned 2009-07-29T10:00:26Z
dc.date.available 2009-07-29T10:00:26Z
dc.date.issued 2004
dc.identifier.citation 30(4), 16-26. en
dc.identifier.uri http://hdl.handle.net/10210/2870
dc.description.abstract The factor analysis of items often produces spurious results in the sense that unidimensional scales appear multi-dimensional. This may be ascribed to failure in meeting the assumptions of linearity and normality on which factor analysis is based. Item response theory is explicitly designed for the modelling of the non-linear relations between ordinal variables and provides a strong alternative to the factor analysis of items. Items may also be combined in parcels that are more likely to satisfy the assumptions of factor analysis than do the items. The use of the Rasch rating scale model and the factor analysis of parcels is illustrated with data obtained with the Locus of Control Inventory. The results of these analyses are compared with the results obtained through the factor analysis of items. It is shown that the Rasch rating scale model and the factoring of parcels produce superior results to the factor analysis of items. Recommendations for the analysis of scales are made. en
dc.language.iso en en
dc.publisher SA Journal of Industrial Psychology en
dc.rights Complies with the rights as specified by the publisher: http://www.sajip.co.za/ & Copyright University of Johannesburg en
dc.subject Factor analysis en
dc.subject Unidimensional scales en
dc.subject Non-linear relations en
dc.subject Rasch rating scale model en
dc.subject Locus of control inventory en
dc.title Problems with the factor analysis of items: solutions based on item response theory and item parcelling. en
dc.type Article en

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