dr. M.J. (Matthijs) Warrens

Universitair hoofddocent

Research

Research interests

In applied research it is frequently required that people are pigeonholed, that is, they are classified into categories. To compare two classifications researchers use so-called association coefficients. These coefficients are formulas that express in a number the similarity or association between two classifications. A value of 1 usually indicates perfect similarity, whereas 0 reflects no similarity. In my research I study mathematical properties of various types of association coefficients. Examples of coefficients are Cohen’s kappa, weighted kappa and Cronbach’s alpha. This theoretical approach may lead to guidelines for researchers on how to interpret and apply the coefficients.

Publications
  1. Similarity, Dissimilarity, and Distance, Measures of

    Gower, J. C. & Warrens, M. J. May-2017 Wiley StatsRef: Statistics Reference Online. Wiley, p. 1-11 11 p.

    Research output: Scientific - peer-reviewChapter

  2. If d is super-metric, then d/(1+d) is super-metric

    Warrens, M. 2017 In : International Mathematical Forum. 12, 18, p. 861-868 8 p.

    Research output: Scientific - peer-reviewArticle

  3. Symmetric kappa as a function of unweighted kappas

    Warrens, M. J. 2017 In : Communications in Statistics. Part B: Simulation and Computation. 46, 7, p. 5240-5245 6 p.

    Research output: Scientific - peer-reviewArticle

  4. Transforming intraclass correlation coefficients with the Spearman-Brown formula

    Warrens, M. J. May-2017 In : Journal of Clinical Epidemiology. 85, p. 14-16 3 p.

    Research output: Scientific - peer-reviewArticle

View all (36) »

Activities
  1. Onderwijs Research Dagen 2016 (ORD)

    Maaike van Rooijen (Speaker), Korpershoek, H. (Contributor), Warrens, M. J. (Contributor), Opdenakker, M. (Contributor)
    2016

    Activity: ScientificParticipation in conference

  2. Kom over de brug! Symposium Overgangen en aansluitingen

    Maaike van Rooijen (Speaker), Korpershoek, H. (Speaker), Warrens, M. J. (Speaker), Opdenakker, M. (Speaker)
    2016

    Activity: ProfessionalParticipation in conference

View all (2) »

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