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
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-review › Chapter
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-review › Article
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-review › Article
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-review › Article
On Association Measures for Continuous Variables and Correction for Chance
Warrens, M. J. 2015 In : Journal of Probability and Statistics. 2015, 6 p., 375491Research output: Scientific - peer-review › Article
Activities
Onderwijs Research Dagen 2016 (ORD)
Maaike van Rooijen (Speaker), Korpershoek, H. (Contributor), Warrens, M. J. (Contributor), Opdenakker, M. (Contributor)2016Activity: Scientific › Participation in conference
Kom over de brug! Symposium Overgangen en aansluitingen
Maaike van Rooijen (Speaker), Korpershoek, H. (Speaker), Warrens, M. J. (Speaker), Opdenakker, M. (Speaker)2016Activity: Professional › Participation in conference
ID: 22505440