16 resultados para Manual test
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A disadvantage of multiple-choice tests is that students have incentives to guess. To discourage guessing, it is common to use scoring rules that either penalize wrong answers or reward omissions. These scoring rules are considered equivalent in psychometrics, although experimental evidence has not always been consistent with this claim. We model students' decisions and show, first, that equivalence holds only under risk neutrality and, second, that the two rules can be modified so that they become equivalent even under risk aversion. This paper presents the results of a field experiment in which we analyze the decisions of subjects taking multiple-choice exams. The evidence suggests that differences between scoring rules are due to risk aversion as theory predicts. We also find that the number of omitted items depends on the scoring rule, knowledge, gender and other covariates.
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Published as an article in: Studies in Nonlinear Dynamics & Econometrics, 2004, vol. 8, issue 3, article 6.
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In this paper we empirically investigate which are the structural characteristics that can help to predict the complexity of NK-landscape instances for estimation of distribution algorithms. To this end, we evolve instances that maximize the estimation of distribution algorithm complexity in terms of its success rate. Similarly, instances that minimize the algorithm complexity are evolved. We then identify network measures, computed from the structures of the NK-landscape instances, that have a statistically significant difference between the set of easy and hard instances. The features identified are consistently significant for different values of N and K.
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The paper investigates whether the growing GDP share of the services sector can contribute to explain the great moderation in the US. We identify and analyze three oil price shocks and use a SVAR analysis to measure their economic impact on the US economy at both the aggregate and the sectoral level. We find mixed support for the explanation of the great moderation in terms of shrinking oil shock volatilities and observe that increases (decreases) in oil shock volatilities are contrasted by a weakening (strengthening) in their transmission mechanism. Across sectors, services are the least affected by any oil shock. As the contribution of services to the GDP volatility increases over time, we conclude that a composition effect contributed to moderate the conditional volatility to oil shocks of the US GDP.
Diseño e implementación de un sistema de test y despasivación de baterías de Litio basado en LabVIEW
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Estudio y resolución del fenómeno de la pasivación en baterías de Cloruro de Tionilo de Litio (LiSOCl2) a través de LabVIEW
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En los últimos años, las Guías Clínicas basadas en la revisión sistemática de la evidencia científica se han convertido en un vehículo esencial para la transferencia efectiva del conocimiento médico a la atención primaria. Sin embargo, su difusión no ha sido todo lo efectiva que hubiera sido deseable. En este contexto aparece Aide Portal (www.aide-portal.ehu.es), el primer portal de habla hispana de Guías Clínicas Informa-tizadas ejecutables. Aide Portal facilita la asimilación del conocimiento contenido en guías clínicas, ya que ofrece múltiples funcionalidades como la particularización de las recomendaciones proporcionadas por las guías a pacientes concretos, la conexión con sistemas de Historia Clínica Electrónica o el acceso a informa-ción terminológica, bibliográfica y farmacológica en tiempo real. En este informe detalla paso a paso cómo extraer el máximo rendimiento de todas las funcionalidades que ofrece Aide Portal, y resultará de especial ayuda a aquellos profesionales del ámbito sanitario que deseen familiarizarse con el mismo.
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Background: Poor outcomes of invasive candidiasis (IC) are associated with the difficulty in establishing the microbiological diagnosis at an early stage. New scores and laboratory tests have been developed in order to make an early therapeutic intervention in an attempt to reduce the high mortality associated with invasive fungal infections. Candida albicans IFA IgG has been recently commercialized for germ tube antibody detection (CAGTA). This test provides a rapid and simple diagnosis of IC (84.4% sensitivity and 94.7% specificity). The aim of this study is to identify the patients who could be benefited by the use of CAGTA test in critical care setting. Methods: A prospective, cohort, observational multicentre study was carried out in six medical/surgical Intensive care units (ICU) of tertiary-care Spanish hospitals. Candida albicans Germ Tube Antibody test was performed twice a week if predetermined risk factors were present, and serologically demonstrated candidiasis was considered if the testing serum dilution was >= 1: 160 in at least one sample and no other microbiological evidence of invasive candidiasis was found. Results: Fifty-three critically ill non-neutropenic patients (37.7% post surgery) were included. Twenty-two patients (41.5%) had CAGTA-positive results, none of them with positive blood culture for Candida. Neither corrected colonization index nor antifungal treatment had influence on CAGTA results. This finding could corroborate that the CAGTA may be an important biomarker to distinguish between colonization and infection in these patients. The presence of acute renal failure at the beginning of the study was more frequent in CAGTA-negative patients. Previous surgery was statistically more frequent in CAGTA-positive patients. Conclusions: This study identified previous surgery as the principal clinical factor associated with CAGTA-positive results and emphasises the utility of this promising technique, which was not influenced by high Candida colonization or antifungal treatment. Our results suggest that detection of CAGTA may be important for the diagnosis of invasive candidiasis in surgical patients admitted in ICU.
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XVII, 352 p.
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The 9th International Test Commission Conference (ITC) took place at the Miramar Palace in San Sebastian, Spain, between the 2nd and 5th of July, 2014. The Conference was titled, “Global and Local Challenges for Best Practices in Assessment.” The International Test Commission, ITC (www.intestcom.org), is an association of national psychological associations, test commissions, publishers, and other organizations, as well as individuals who are committed to the promotion of effective testing and assessment policies and to the proper development, evaluation, and uses of educational and psychological instruments. The ITC facilitates the exchange of information among members and stimulates their cooperation on problems related to the construction, distribution, and uses of psychological and educational tests and other psychodiagnostic tools. This volume contains the abstracts of the contributions presented at the 9th International Test Commission Conference. The four themes of the Conference were closely linked to the goals of the ITC: - Challenges and Opportunities in International Assessment. - Application of New Technoloogies and New Psychometric Models in Testing. - Standards and Guidelines for Best Testing Practices. - Testing in Multilingual and Multicultural Contexts.
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Índice: - Formulación Lagrangiana. - Formulación Hamiltoniana. - Ecuación de Hamilton-Jacobi. - Teoría de Perturbaciones. - Sistemas Continuos. - Mecánica y Geometría Diferencia
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Este libro pretende ser un resumen de los apuntes utilizados en clase durante los últimos once años en la impartición de la asignatura de Proyectos, dentro de la antigua Ingeniería Técnica de Obras Públicas, que tras la implantación de Bolonia ha sido reemplazada por la de Ingeniería Civil. Tiene un enfoque eminentemente práctico; muchos de los apartados de este libro no son de obligado cumplimiento o imprescindibles de cara a ser incorporados a un proyecto de ingeniería civil. Pueden ser adaptados o presentados de un modo diferente, en algunos casos, e incluso son meras sugerencias, además de algunos ejemplos que se han incorporado. Estas páginas están enfocadas sobre todo a entender la documentación que forma un proyecto, de cara a que el alumno tenga claro cómo debe de plasmar todos los planos, cálculos e información que se genera a medida que avanzamos en el proyecto.
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Las prácticas de psicometría son actividades diseñadas con la finalidad de fortalecer y afianzar los conocimientos y destrezas propios a la disciplina. Las tareas y trabajos a desarrollar dentro de las prácticas de psicometría facilitan la aprehension de los conceptos, métodos y técnicas necesarias para la construcción de tests, la evaluación de los instrumentos de medida y su correcto uso.
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Este proyecto trata de abordar las transformaciones entre diferentes estándares para Test Informatizados, de manera automática, gracias a la Ingeniería dirigida por Modelos (MDE - Model Driven Engineer), para así obtener un estándar capaz de formar parte en una plataforma de ejecución de Guías de Práctica Clínica. Esto se consigue mediante la generación automática de Guías de Test, partiendo de Test Informatizados en los formatos estándar Aiken y Gift.
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Elektroestimulazioak eskaladako test espezifikoetan duen eragina ikusteko, maila ezberdineko Oñatiko bederatzi eskalatzaileri egindako interbentzioa da.
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En el siguiente estudio se analiza, mediante el test de 20 minutos, la mejora en el rendimiento de diez remeros pertenecientes a un club de elite. Estos sujetos, se sometieron a dos test en diferentes fechas de la temporada. Se hizo una comparación entre ambas pruebas. Las variables analizadas en esa comparación y que muestran la evolución de los deportistas son las siguientes: wattios, ritmo y frecuencia cardiaca. Analizando los wattios se calculó la potencia obtenida durante todo el test, con el ritmo nos referimos a las paladas por minuto y mirando la frecuencia cardiaca pudimos obtener dos indicadores: cuál es el porcentaje de la frecuencia cardiaca máxima con la que cada deportista realizó la prueba y en qué medida recuperaba cada sujeto.