Showing results 81 to 100 of 128
  Correlates of personal fluctuation, pseudo-guessing, and inattention subject parameters: relations with parametric and non parametric person fit indices; ; et al Conference (2009, July) Detailed reference viewed: 29 (0 ULg)An item ixture model to detect differential item functioning; ; et al Conference (2009, July) Detailed reference viewed: 9 (0 ULg)A robust statistical approach to differential item functioningMagis, David  ; Conference (2009, July) Detailed reference viewed: 14 (0 ULg)Comparaison empirique des méthodes classiques de détection du fonctionnement différentiel d’items en psychométrieMagis, David ; ; Conference (2009, May) Detailed reference viewed: 10 (3 ULg)Une solution numérique au test de Cattell pour déterminer le nombre de composantes principales à retenir; Magis, David ; et alConference (2009, May) Detailed reference viewed: 22 (0 ULg)Local equating methods in the NEAT design; Magis, David ; et alConference (2009, April) Detailed reference viewed: 32 (1 ULg)La correction du résultat d’un étudiant en présence de tentatives de fraudes; Magis, David ; Scientific conference (2009, January) Detailed reference viewed: 3 (0 ULg) La détection des patrons de réponses problématiques dans le contexte des tests informatisés; ; Magis, David in Blais, Jean-Guy (Ed.) Evaluation des apprentissages et technologies de l’information et de la communication : Enjeux, applications et modèles de mesure (2009) Detailed reference viewed: 4 (1 ULg)Crossed random effects models for the detection of differential item functioning in psychometricsMagis, David ; ; et alConference (2008, October) Detailed reference viewed: 2 (0 ULg)Detection of differential item functioning: crossed random-effects models and robust diagnostics toolsMagis, David ; Scientific conference (2008, September) Detailed reference viewed: 3 (0 ULg)Multidimensional item response theory models integrating additional inattention, pseudo-guessing, and discrimination person parameters; Magis, David ; Conference (2008, June) Detailed reference viewed: 12 (0 ULg)A crossed random effects model to detect differential item functioning; Magis, David ; et alConference (2008, June) Detailed reference viewed: 4 (0 ULg)L’utilisation des simulations informatisées pour la recherche en éducation; ; et al Conference (2008, May) Detailed reference viewed: 3 (0 ULg)Some score-equating methods in psychometrics and educationMagis, David Scientific conference (2008, February) Detailed reference viewed: 5 (0 ULg)Adaptive Bayesian estimation of proficiency level in computerized adaptive testingMagis, David Scientific conference (2008, February) Detailed reference viewed: 3 (0 ULg)Alteration of Right Ventricular-Pulmonary Vascular Coupling in a Porcine Model of Progressive Pressure OverloadingGhuysen, Alexandre ; Lambermont, Bernard ; Kolh, Philippe et alin Shock (Augusta, Ga.) (2008), 29(2), 197-204 In acute pulmonary embolism, right ventricular (RV) failure may result from exceeding myocardial contractile resources with respect to the state of vascular afterload. We investigated the adaptation of RV ... [more ▼] In acute pulmonary embolism, right ventricular (RV) failure may result from exceeding myocardial contractile resources with respect to the state of vascular afterload. We investigated the adaptation of RV performance in a porcine model of progressive pulmonary embolism. Twelve anesthetized pigs were randomly divided into two groups: gradual pulmonary arterial pressure increases by three injections of autologous blood clot (n = 6) or sham-operated controls (n = 6). Right ventricular pressure-volume (PV) loops were recorded using a conductance catheter. Right ventricular contractility was estimated by the slope of the end-systolic PV relationship (Ees). Afterload was referred to as pulmonary arterial elastance (Ea) and assessed using a four-element Windkessel model. Right ventricular-arterial coupling (Ees/Ea) and efficiency of energy transfer (from PV area to external mechanical work [stroke work]) were assessed at baseline and every 30 min for 4 h. Eaincreased progressively after embolization, from 0.26 +/- 0.04 to 2.2 +/- 0.7 mmHg mL (P < 0.05). Ees increased from 1.01 +/-0.07 to 2.35 +/- 0.27 mmHg mL (P < 0.05) after the first two injections but failed to increase any further. As a result, Ees/Ea initially decreased to values associated with optimal SW, but the last injection was responsible for Ees/Ea values less than 1, decreased stroke volume, and RV dilation. Stroke work/PV area consistently decreased with each injection from 79% +/- 3% to 39% +/- 11% (P < 0.05). In response to gradual increases in afterload, RV contractility reserve was recruited to a point of optimal coupling but submaximal efficiency. Further afterload increases led to RV-vascular uncoupling and failure. [less ▲] Detailed reference viewed: 19 (4 ULg)An efficient method to generate data and compute exact P-values in goodness-of-fit testingMagis, David in Communications in Statistics : Simulation & Computation (2008), 37 In this article, we use a characterization of the set of sample counts that do not match with the null hypothesis of the test of goodness of fit. Two direct applications arise: first, to instantaneously ... [more ▼] In this article, we use a characterization of the set of sample counts that do not match with the null hypothesis of the test of goodness of fit. Two direct applications arise: first, to instantaneously generate data sets whose corresponding asymptotic P-values belong to a certain pre-defined range; and second, to compute exact P-values for this test in an efficient way. We present both issues before illustrating them by analyzing a couple of data sets. Method’s efficiency is also assessed by means of simulations. We focus on Pearson’s X2 statistic but the case of likelihood-ratio statistic is also discussed. [less ▲] Detailed reference viewed: 8 (2 ULg)Equating the Chilean university entrance examMagis, David ; ; et alConference (2007, November) Detailed reference viewed: 5 (0 ULg)Est-ce qu'il est possible d'obtenir le résultat véritable d'un élève même si celui-ci tente de tricher ?; ; Magis, David Conference (2007, October) Detailed reference viewed: 1 (0 ULg)Quick data set generation and exact P-value computation in goodness-of-fit testingMagis, David Conference (2007, October) Detailed reference viewed: 2 (0 ULg) |
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