Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 506476
Title A recommendation for applied researchers to substantiate the claim that ordinal variables are the product of underlying bivariate normal distributions
Author(s) Kampen, Jarl K.; Weeren, Arie
Source Quality and quantity: international journal of methodology 51 (2017)5. - ISSN 0033-5177 - p. 2163 - 2170.
Department(s) Education and Competence Studies
Publication type Refereed Article in a scientific journal
Publication year 2017
Keyword(s) Acquiescence bias - Measurement scale - Non-differentiation - Ordinal variable - Polychoric correlation - Test
Abstract A simulation study was carried out to study the behaviour of the polychoric correlation coefficient in data not compliant with the assumption of underlying continuous variables. Such data can produce relatively high estimated polychoric correlations (in the order of .62). Applied researchers are prone to accept these artefacts as input for elaborate modelling (e.g., structural equation models) and inferences about reality justified by sheer magnitude of the correlations. In order to prevent this questionable research practice, it is recommended that in applications of the polychoric correlation coefficient, data is tested with goodness-of-fit of the BND, that such statistic is reported in published applications, and that the polychoric correlation is not applied when the test is significant.
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