3 resultados para Exact sampling formula for the Wright-Fisher model

em Universidad del Rosario, Colombia


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The aim of this study was to evaluate the performance of the Dimensional Clinical Personality Inventory (DCPI) using Rasch-based person and item analysis. 1281 participants were recruited, between 18 and 90 years of age (M=26.64; SD=8.94), 431 men (33.6%) and 127 (9.9%) patients diagnosed with axis I disorders and/or axis II according to DSM-IV-TR. Results indicated the IDCP scales performed reasonably well, and the usefulness of the analyses presented, demonstrate the Rasch model’s applicability for clinical applications. Among the important tools offered by the Rasch model, we explore the use of the person-item map, which visually presents the intuitively understandable psychological construct along the dimensional scale of the instrument.

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El presente trabajo de investigación corresponde a un estudio exploratorio-descriptivo que indaga las motivaciones de un grupo de estudiantes de psicología de la Universidad del Rosario (UR) en Bogotá Colombia, para asistir a actividades extracurriculares (AEC). El grupo se compone de 131 estudiantes de segundo a noveno semestre. Para indagar las motivaciones, se elaboró una encuesta basada en el modelo de metas de Alonso (1991) que incluye metas relacionadas con la tarea, la autovaloración, la valoración social y consecución de recompensas externas. La encuesta se aplicó desde el segundo semestre de 2009 al primer semestre de 2011. Para el análisis estadístico se utilizó el software SPSS y se elaboraron distribuciones de frecuencia y tablas de contingencia. Para observar la posible relación entre asistencia a AEC y las motivaciones de los estudiantes se utilizó el Chi Cuadrado y el Estadístico Exacto de Fisher. Los resultados indican que existe relación entre la asistencia a AEC ofrecidas por la UR desde que estudia psicología y la motivación intrínseca (P=0,006), y la asistencia a AEC antes de entrar a estudiar psicología y la consecución de premios y recompensas a nivel social (P=0,021).

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Objective: To establish a prediction model of the degree of disability in adults with Spinal CordInjury (SCI ) based on the use of the WHO-DAS II . Methods: The disability degree was correlatedwith three variable groups: clinical, sociodemographic and those related with rehabilitation services.A model of multiple linear regression was built to predict disability. 45 people with sci exhibitingdiverse etiology, neurological level and completeness participated. Patients were older than 18 andthey had more than a six-month post-injury. The WHO-DAS II and the ASIA impairment scale(AIS ) were used. Results: Variables that evidenced a significant relationship with disability were thefollowing: occupational situation, type of affiliation to the public health care system, injury evolutiontime, neurological level, partial preservation zone, ais motor and sensory scores and number ofclinical complications during the last year. Complications significantly associated to disability werejoint pain, urinary infections, intestinal problems and autonomic disreflexia. None of the variablesrelated to rehabilitation services showed significant association with disability. The disability degreeexhibited significant differences in favor of the groups that received the following services: assistivedevices supply and vocational, job or educational counseling. Conclusions: The best predictiondisability model in adults with sci with more than six months post-injury was built with variablesof injury evolution time, AIS sensory score and injury-related unemployment.