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Supplemental Material for Empirical Priors in Polytomous Computerized Adaptive Testings: Risks and Rewards in Clinical Settings by Niek Frans, Johan Braeken, Bernard P. Veldkamp, and Muirne C. S. Paap in Applied Psychological Measurement

SummaryFive diagnostic criteria sets for pathological grief are currently used in research. Studies evaluating their performance indicate that it is not justified to generalise findings regarding prevalence rates and predictive validity across studies using different diagnostic criteria of pathological grief. We provide recommendations to move the bereavement field forward.

Supplemental material, Online_Supplement_SCID-5-AMPD-IRT for A Psychometric Analysis of the Structured Clinical Interview for the DSM-5 Alternative Model for Personality Disorders Module I (SCID-5-AMPD-I): Level of Personality Functioning Scale by Benjamin Hummelen, Johan Braeken, Tore Buer Christensen, Tor Erik Nysaeter, Sara Germans Selvik, Kristoffer Walther, Geir Pedersen, Ingeborg Eikenaes and Muirne C. S. Paap in Assessment

Supplemental material, Appendix_assymetry_R2 for Making Fixed-Precision Between-Item Multidimensional Computerized Adaptive Tests Even Shorter by Reducing the Asymmetry Between Selection and Stopping Rules by Johan Braeken and Muirne C. S. Paap in Applied Psychological Measurement

Supplementary Material, onlinesupplement_APM-17-08-151.R1 for Measurement Efficiency for Fixed-Precision Multidimensional Computerized Adaptive Tests: Comparing Health Measurement and Educational Testing Using Example Banks by Muirne C. S. Paap, Sebastian Born and Johan Braeken in Applied Psychological Measurement

We used item response theory (IRT) to (a) investigate the dimensionality of the Symptom Checklist-90-Revised (SCL-90-R) in a severely disturbed patient group, (b) improve the subscales in a meaningful way and (c) investigate the measurement precision of the improved scales. The total sample comprised 3078 patients (72% women, mean age=35 +/- 9) admitted to 14 different day hospitals participating in the Norwegian Network of Personality-focused Treatment Programmes. Mokken Scale Analysis was used to investigate the dimensionality of the SCL-90-R and improve the subscales. This analysis was theory-driven: the scales were built on two start items that reflected the content of the disorder that corresponds with the specific scale. The Graded Response Model was employed to determine measurement precision. Our theory-driven IRT approach resulted in a new seven-factor solution including 60 of the 90 items clustered in seven scales: depression, agoraphobia, physical complaints, obsessive-compulsive, hostility (unchanged), distrust and psychoticism. Most of the new scales discriminated reliably between patients with moderately low scores to moderately high scores. In conclusion, we found support for the multidimensionality of the SCL-90-R in a large sample of severely disturbed patients. Copyright (C) 2011 John Wiley & Sons, Ltd.