Reversed Thresholds in Partial Credit Models : A Reason for Collapsing Categories?

Wetzel, Eunike; Carstensen, Claus H.

Reversed Thresholds in Partial Credit Models : A Reason for Collapsing Categories?

Dateien

Wetzel_0-291862.pdfGröße: 412.75 KBDownloads: 916

Datum

2014

Autor:innen

Wetzel, Eunike

Carstensen, Claus H.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Psychologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Assessment. 2014, 21(6), pp. 765-774. ISSN 1073-1911. eISSN 1552-3489. Available under: doi: 10.1177/1073191114530775

Zusammenfassung

When questionnaire data with an ordered polytomous response format are analyzed in the framework of item response theory using the partial credit model or the generalized partial credit model, reversed thresholds may occur. This led to the discussion of whether reversed thresholds violate model assumptions and indicate disordering of the response categories. Adams, Wu, and Wilson showed that reversed thresholds are merely a consequence of low frequencies in the categories concerned and that they do not affect the order of the rating scale. This article applies an empirical approach to elucidate the topic of reversed thresholds using data from the Revised NEO Personality Inventory as well as a simulation study. It is shown that categories differentiate between participants with different trait levels despite reversed thresholds and that category disordering can be analyzed independently of the ordering of the thresholds. Furthermore, we show that reversed thresholds often only occur in subgroups of participants. Thus, researchers should think more carefully about collapsing categories due to reversed thresholds.

Fachgebiet (DDC)

150 Psychologie

Schlagwörter

partial credit model, generalized partial credit model, threshold parameters, reversed thresholds, ordered rating scales

Zitieren

ISO 690

WETZEL, Eunike, Claus H. CARSTENSEN, 2014. Reversed Thresholds in Partial Credit Models : A Reason for Collapsing Categories?. In: Assessment. 2014, 21(6), pp. 765-774. ISSN 1073-1911. eISSN 1552-3489. Available under: doi: 10.1177/1073191114530775

BibTex

@article{Wetzel2014Rever-31824,
  year={2014},
  doi={10.1177/1073191114530775},
  title={Reversed Thresholds in Partial Credit Models : A Reason for Collapsing Categories?},
  number={6},
  volume={21},
  issn={1073-1911},
  journal={Assessment},
  pages={765--774},
  author={Wetzel, Eunike and Carstensen, Claus H.}
}

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