References of "Magis, David"
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See detailClinical pathway evaluation for left and sigmoid colectomy in abdominal surgery
Mattart, Laurine; Stevens, Marie; Debergh, Nicolas et al

in Cianci, Pasquale (Ed.) Proctological Diseases in Surgical Practice (in press)

At the end of 2008, a new left colon clinical pathway was implemented in our hospital and set up by a multidisciplinary team, monitored by a clinical pathway coordinator. Our aim was to evaluate the ... [more ▼]

At the end of 2008, a new left colon clinical pathway was implemented in our hospital and set up by a multidisciplinary team, monitored by a clinical pathway coordinator. Our aim was to evaluate the quality of left and sigmoid colectomy management, to simplify the clinical pathway and to assess its impact on the patient, the medical and nursing staffs. A sample of 290 patients with benign or malignant disease requiring a laparoscopic of laparotomy left colon resection (mainly sigmoid) was included in this clinical pathway during the years 2009 to 2017. Our analysis focused particularly on the compliance with the protocol, the pain felt, the suture leak rate, the hospital stay, the re-hospitalization rate and redo surgery within 30 days. Our work leads to the conclusion that the introduction of a clinical pathway, when it is well prepared and brings together all the implicated persons with the same goal, is feasible with convincing results. These are directly beneficial to the patient and to the quality of its management. [less ▲]

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See detailPassage de l’administration fixe d’un test à une administration adaptative : application au TCALS-II
Magis, David ULiege; Raîche, Gilles

in Raîche, Gilles; Ndinga, Pascal; Meunier, Hélène (Eds.) L'interdisciplinarité de la mesure et de l’évaluation (in press)

La problématique du passage de l’administration fixe (de type papier-crayon) à une administration adaptative d’un test est étudiée. Une méthode en deux étapes est présentée. Dans un premier temps, des ... [more ▼]

La problématique du passage de l’administration fixe (de type papier-crayon) à une administration adaptative d’un test est étudiée. Une méthode en deux étapes est présentée. Dans un premier temps, des patrons de réponses sont générés selon une administration fixe, dans le but de déterminer des valeurs admissibles de l’erreur-type d’estimation du niveau d’habileté. Ensuite, ces valeurs sont utilisées comme critères d’arrêt lors d’une administration adaptative du même test. La longueur du test est alors considérée pour évaluer la qualité du test par rapport à sa version fixe. Le test de classement en anglais, langue seconde, au collégial (TCALS-II) est utilisé en guise d’illustration. Il est établi qu’une administration adaptative du TCALS-II permettrait de réduire sensiblement la longueur du test, sans perte de qualité de l’estimation des niveaux d’habileté. Toutefois, cette amélioration est limitée aux sujets ne présentant pas un niveau d’habileté trop faible ou trop important. [less ▲]

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See detailDoes the development of syntax comprehension show a premature asymptote among persons with Down syndrome? A cross-sectional analysis
Facon, Bruno; Magis, David ULiege

in American Journal on Intellectual and Developmental Disabilities (2019)

Uncertainty persists regarding the post-childhood trajectory of syntactic acquisition of persons with Down syndrome (DS). In some studies asymptote is reached in the early teens, whereas others find ... [more ▼]

Uncertainty persists regarding the post-childhood trajectory of syntactic acquisition of persons with Down syndrome (DS). In some studies asymptote is reached in the early teens, whereas others find syntax continuing to develop at least into early adulthood. This study addressed the issue using a cross-sectional approach. Receptive syntax and receptive vocabulary were tested in 62 children, adolescents and young adults with DS matched on CA and cognitive level with 62 participants with intellectual disability of undifferentiated etiology. On both tests there were significant effects of CA and diagnosis, but the CA × diagnosis interactions were nonsignificant. It is concluded that comprehension of vocabulary and syntax does not asymptote prematurely among persons with DS. [less ▲]

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See detailBasic visual perceptual processes in children with typical development and cerebral palsy: The processing of surface, length, orientation, and position
Schmetz, Emilie ULiege; Magis, David ULiege; Detraux, Jean-Jacques ULiege et al

in Child Neuropsychology: A Journal on Normal and Abnormal Development in Childhood and Adolescence (2019)

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See detailMore accurate asymptotic standard error formulas for IRT ability estimators
Magis, David ULiege

Conference (2018, September 12)

Most-known IRT ability estimators under dichotomous scoring (MLE, BME, WLE and robust) have associated, simple and fancy formulas to derive their associated (asymptotic) standard errors (ASEs). Such ASEs ... [more ▼]

Most-known IRT ability estimators under dichotomous scoring (MLE, BME, WLE and robust) have associated, simple and fancy formulas to derive their associated (asymptotic) standard errors (ASEs). Such ASEs are of primary interest for determining the degree of precision of the ability estimates but also in more specific contexts, such as e.g., CAT stopping rules. However, some of these ASEs were derived under spurious assumptions or only recently and are therefore not yet widespread. The purpose of ths talk is to present a general and unified approach to derive ASE formulas for a broad cass of dichotomous IRT ability estimators that encompass the most-known ones. Using mathematical derovations for asymptotic convergence of Taylor series expansion, a general ASE formula is derived and can be immediately applied to any classical IRT estimator. Some surprising results are encountered and discussed. Eventually, their potential usefulness in e.g., CAT context, is outlined. [less ▲]

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See detailComputerized adaptive and multistage testing with R
Magis, David ULiege; Yan, Duanli; von Davier, Alina

Conference (2018, July 09)

The goal of this workshop is to provide a practical (and brief) overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST), and illustrate the methodologies and ... [more ▼]

The goal of this workshop is to provide a practical (and brief) overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST), and illustrate the methodologies and applications using R open source language and several data examples. The implementations rely on the R packages catR and mstR that have been already or are being developed and include some of the newest research algorithms developed by the authors. This workshop will cover several topics: the basics of R, theoretical overview of CAT and MST, CAT and MST designs, assembly methodologies, catR and mstR packages, simulations and applications. The intended audience for the workshop is undergraduate/graduate students, faculty, researchers, practitioners at testing institutions, and anyone in psychometrics, measurement, education, psychology and other fields who is interested in computerized adaptive and multistage testing, especially in practical implementations of simulation using R. [less ▲]

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See detailAdaptive testing: examples, simulations, and examples of simulations
Magis, David ULiege

Conference (2018, July 04)

This talk will cover the topic of adaptive testing in psychometrics, both at the item level (CAT) and at the module level (MST). The presentation is divided in three parts. First, a brief conceptual ... [more ▼]

This talk will cover the topic of adaptive testing in psychometrics, both at the item level (CAT) and at the module level (MST). The presentation is divided in three parts. First, a brief conceptual description of CAT and MST frameworks is provided, with emphasis on practical advantages and drawbacks of each of them. Second, it is explained why and how simulation studies can be very useful in adaptive testing, among others, to correctly and suitably establish a real test administration plan. Third, examples of such simulation studies will be outlined, based on the R packages catR and mstR developed for that purpose. [less ▲]

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See detailWorkshop on CAT
Magis, David ULiege

Scientific conference (2018, June 05)

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See detailLaparoscopic distal pancreatectomy: Good oncological outcome, an utopia?
Goussens, A. K.; Mattart, Laurine; Weerts, Joseph et al

Poster (2018, May 03)

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See detailUn autre regard sur les réponses des élèves canadiens au test PISA de 2003 à 2015
Raiche, Gilles; Béland, Sébastien; Magis, David ULiege

Conference (2017, November 16)

Le Programme international pour le suivi des acquis des élèves (PISA) a pour objectif de produire des indicateurs sur les habiletés et les connaissances qui contribuent au succès des élèves, des écoles ... [more ▼]

Le Programme international pour le suivi des acquis des élèves (PISA) a pour objectif de produire des indicateurs sur les habiletés et les connaissances qui contribuent au succès des élèves, des écoles, des systèmes éducatifs et des environnements d’apprentissage (CMEC, 2015, p. 7). Depuis 2000, l’enquête du PISA est planifiée à tous les trois ans pour les élèves de 15 ans en ciblant spécifiquement les matières suivantes : la compréhension de l’écrit, la culture mathématique et la culture scientifique. Dans le cadre de la dernière passation, les résultats des Canadiens à cette enquête ont été salués dans l’ensemble du pays : les élèves se classent dans le groupe des pays les plus performants pour toutes les disciplines couvertes. Par contre, le taux de participation des écoles ainsi que les taux d’exclusions des élèves au regard de divers handicaps, qui pourraient éventuellement avoir un impact sur les résultats et le classement international, ont été critiqués à travers le pays. Cette présentation a comme objectif d’étudier le rendement des élèves canadiens au programme international des acquis scolaires (PISA) entre 2000 à 2015 en fonction de différentes caractéristiques relatives à la participation des écoles et au taux d’exclusion des élèves présentant certains handicaps. Des modèles de régression linéaire à niveaux multiples sont utilisés à cette fin. [less ▲]

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See detailmstR: An R package to generate multistage testing designs
Magis, David ULiege; Yan, Duanli; von Davier, Alina

Conference (2017, July 18)

Multistage testing (MST; Yan, von Davier & Lewis, 2014) has become an important framework of tailored testing. Similarly to computerized adaptive testing (CAT) it proposes an optimal routing of the ... [more ▼]

Multistage testing (MST; Yan, von Davier & Lewis, 2014) has become an important framework of tailored testing. Similarly to computerized adaptive testing (CAT) it proposes an optimal routing of the administered items according to the previous test taker’s responses. However, items are not selected and administered as single units but as modules (subsets). The main goal of MST consists in selecting the optimal path of modules across the successive stages of the test. Unfortunately, if various operational testing programs are nowadays considering MST for practical administrations, there is still very limited access to accurate software that can either treat or generate MST scenarios for research purposes. In this talk we succinctly present a new package from the R software, called mstR (Magis, Yan & von Davier, 2017). Built in the same spirit of the package catR for CAT designs, it permits to generate repeated response patterns under a predefined MST scenario by providing the set of modules and related item parameters, the number of stages and the connections between modules from successive stages. Several rules for optimal module selection and ability estimation (under IRT framework or based on test scores) are also available. This talk will mostly focus on the (non-technical) description of package mstR and its main features. An example will also be described as an illustration of this framework. [less ▲]

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See detailItem purification versus adjustments for multiple comparisons in DIF detection
Drabinova, Adela; Martinkova, Patricia; Magis, David ULiege

Poster (2017, July 18)

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See detailClinical pathway evaluation for left and sigmoid colectomy in abdominal surgery
Mattart, Laurine; Stevens, Marie; Magis, David ULiege et al

Poster (2017, May 19)

Detailed reference viewed: 19 (2 ULiège)
See detailComputerized adaptive testing: Principles, issues and implementation
Magis, David ULiege

Scientific conference (2017, April 07)

Computerized adaptive testing (CAT) has become an important field of research for educational and psychological measurement. It provides tailored testing at the test taker level, focusing on the optimal ... [more ▼]

Computerized adaptive testing (CAT) has become an important field of research for educational and psychological measurement. It provides tailored testing at the test taker level, focusing on the optimal administration of the items to improve accuracy and precision in individual ability estimation. Yet, practical implementation of CAT programs are still demanding both in terms of item bank creation and calibration, and require appropriate online platforms and suitable algorithms for underlying psychometric computations. The purpose of this workshop is twofold: (a) to briefly introduce the concepts of item response theory (IRT) and CAT in a practical, end-user approach; (b) to present a package of the R software, called catR, that performs all underlying IRT- and CAT-related calculations. This package is also adequate to perform simulation studies, which are most useful to assess the quality of an item and help in designing efficient CATs. Some live demonstrations of catR will be proposed to conclude the workshop. participants are invited to bring their laptops with R and RStudio software pre-installed. Electronic copies of the presentation and an R script with the code for illustrative examples will be provided. [less ▲]

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See detailA modified graded response model to account for guessing in multiple-choice items
Magis, David ULiege

Conference (2017, February 09)

This presentation focuses on multiple-choice items without any correction or control for guessing. Most often, item responses are recoded as binary outcomes so that dichotomous logistic item response ... [more ▼]

This presentation focuses on multiple-choice items without any correction or control for guessing. Most often, item responses are recoded as binary outcomes so that dichotomous logistic item response models (such as the 2PL or 3PL models) can be used to estimate ability levels. This is however at the cost of loosing information from collapsing all distractors into a single FALSE category. Polytomous IRT models could be considered to overcome that drawback but none of the classical models are suitable to incorporate guessing into account. The purpose of this talk is to introduce a modification to the graded response model (Samejima, 1969) that can take guessing into account. The modification consists in introducing lower and upper asymptotes to the cumulative probability curves. After a brief theoretical and technical description, practical implementation using the R package mirt (Chalmers, 2012) is discussed. Primary results from a simulation study are eventually presented and compared to traditional IRT scoring methods for scoring multiple-choice items. [less ▲]

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See detailModélisation de la réponse au hasard dans les questionnaires à choix multiples : une approche par modèles de réponses aux items polytomiques
Magis, David ULiege

Conference (2017, January 25)

Lorsque l’on doit évaluer les résultats d’un test à l’aide de questions à choix multiples (QCM), le traitement des réponses au hasard (« guessing ») est un enjeu crucial pour une évaluation fiable et non ... [more ▼]

Lorsque l’on doit évaluer les résultats d’un test à l’aide de questions à choix multiples (QCM), le traitement des réponses au hasard (« guessing ») est un enjeu crucial pour une évaluation fiable et non biaisée de la compétence testée. Divers mécanismes (comme l’application d’une correction pour le guessing) ont été proposées mais ne sont pas exemptes de problèmes méthodologiques. Une approche par modèles de réponses aux items (MRI) est aussi souvent considérée, mais revient à résumer les réponses des QCM en « vrai/faux » et appliquer des modèles dichotomiques (comme le modèle logistique à trois paramètres). Le but de cette présentation est double : (a) mettre en évidence les faiblesses d’une telle approche dichotomique, et (b) présenter une modification d’un modèle de réponses aux items polytomiques qui prend en compte le possible « guessing » des participants. Cette approche a l’avantage de modéliser chaque réponse possible (y compris les distracteurs) tout en autorisant une réponse au hasard pour les participants de compétence plus faibles. Une comparaison des approches dichotomique et polytomique est réalisée au moyen de données simulées selon un modèle de réponse au hasard plausible. Les avantages et inconvénients de l’approche polytomique, tant du point de vue technique que pédagogique, sont discutés. [less ▲]

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See detailLa détection des réponses inappropriées dans les examens: une étude de 3 indices corrigés selon la méthode de Snijders
Béland, Sébastien; Raîche, Gilles; Magis, David ULiege

Conference (2017, January 25)

Certains étudiants peuvent répondre au hasard ou être inattentifs en situation d’examen. Les indices de détection de patrons de réponses inappropriés (person-fit index) sont prometteurs pour détecter ces ... [more ▼]

Certains étudiants peuvent répondre au hasard ou être inattentifs en situation d’examen. Les indices de détection de patrons de réponses inappropriés (person-fit index) sont prometteurs pour détecter ces types de réponse. Nous allons, dans le cadre de cette communication, nous pencher sur le cas de trois indices de détection populaires qui présentent des caractéristiques permettant d’en faciliter l’interprétation : lz, ZU et ZW. Par contre, des études antérieures ont montré que ces trois indices sont fortement affectés par le fait que l’habileté d’un étudiant est estimée plutôt que réelle (Molenaar et Hoijtink, 1990). Snijders (2001) a proposé une version corrigée de l’indice lz (nommée lz*) afin de tenir compte de cette difficulté. De leur côté, Magis, Béland et Raîche (2014) ont corrigé deux autres indices selon l’approche de Snijders (2001) : U* et W*. Il reste cependant à analyser plus en détails le comportement de la famille des indices corrigés, soit, lz*, U* et W*. Pour ce faire, nous effectuons une étude de simulation et une étude des données du test de classement en anglais, langue seconde (TCALS-II). Les résultats démontrent que les indices corrigés lz* et W* sont les plus intéressants à utiliser. De son côté, U* présente des résultats parfois inappropriés, ce qui relance la réflexion sur la pertinence des indices de détection basés sur les carré-moyens non-pondérés. [less ▲]

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See detailLay Listeners Can Evaluate the Pitch Accuracy of Operatic Voices
Larrouy-Maestri, Pauline ULiege; Morsomme, Dominique ULiege; Magis, David ULiege et al

in Music Perception (2017), 34(4), 489-495

Lay listeners are reliable judges when evaluating pitch accuracy of occasional singers, suggesting that enculturation and laypersons’ perceptual abilities are sufficient to judge “simple” music material ... [more ▼]

Lay listeners are reliable judges when evaluating pitch accuracy of occasional singers, suggesting that enculturation and laypersons’ perceptual abilities are sufficient to judge “simple” music material adequately. However, the definition of pitch accuracy in operatic performances is much more complex than in melodies performed by occasional singers. Furthermore, because listening to operatic performances is not a common activity, laypersons‘ experience with this complicated acoustic signal is more limited. To address the question of music expertise in evaluating operatic singing voices, listeners without music training were compared with the music experts examined in a recent study (Larrouy-Maestri, Magis, & Morsomme, 2014a) and their ratings were modeled with regard to underlying acoustic variables of pitch accuracy. As expected, some participants lacked test-retest reliability in their judgments. However, listeners who used a consistent strategy relied on a definition of pitch accuracy that appears to overlap with the quantitative criteria used by music experts. Besides clarifying the role of music expertise in the evaluation of melodies, our findings show robust perceptual abilities in laypersons when listening to complex signals such as operatic performances. [less ▲]

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See detailComputerized adaptive and multistage testing with R
Magis, David ULiege; Yan, Duanli; von Davier, Alina

Book published by Springer (2017)

The goal of this guide and manual is to provide a practical and brief overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST) and to illustrate the methodologies and ... [more ▼]

The goal of this guide and manual is to provide a practical and brief overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST) and to illustrate the methodologies and applications using R open source language and several data examples. Implementation relies on the R packages catR and mstR that have been already or are being developed by the first author (with the team) and that include some of the newest research algorithms on the topic. The book covers many topics along with the R-code: the basics of R, theoretical overview of CAT and MST, CAT designs, CAT assembly methodologies, CAT simulations, catR package, CAT applications, MST designs, IRT-based MST methodologies, tree-based MST methodologies, mstR package, and MST applications. CAT has been used in many large-scale assessments over recent decades, and MST has become very popular in recent years. R open source language also has become one of the most useful tools for applications in almost all fields, including business and education. Though very useful and popular, R is a difficult language to learn, with a steep learning curve. Given the obvious need for but with the complex implementation of CAT and MST, it is very difficult for users to simulate or implement CAT and MST. Until this manual, there has been no book for users to design and use CAT and MST easily and without expense; i.e., by using the free R software. All examples and illustrations are generated using predefined scripts in R language, available for free download from the book's website. [less ▲]

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