Statistical Analysis of Eco-Toxicologic Data of Mammals from a Polluted Area

Several eco-toxicological studies have shown that insectivorous mammals, due to their feeding habits, easily accumulate high amounts of pollutants in relation to other mammal species. To assess the bio-accumulation levels of toxic metals and their in°uence on essential metals, we quantified the concentration of 19 elements (Ca, K, Fe, B, P, S, Na, Al, Zn, Ba, Rb, Sr, Cu, Mn, Hg, Cd, Mo, Cr and Pb) in bones of 105 greater white-toothed shrews (Crocidura russula) from a polluted (Ebro Delta) and a control (Medas Islands) area. Since chemical contents of a bio-indicator are mainly compositional data, conventional statistical analyses currently used in eco-toxicology can give misleading results. Therefore, to improve the interpretation of the data obtained, we used statistical techniques for compositional data analysis to define groups of metals and to evaluate the relationships between them, from an inter-population viewpoint. Hypothesis testing on the adequate balance-coordinates allow us to confirm intuition based hypothesis and some previous results. The main statistical goal was to test equal means of balance-coordinates for the two defined populations. After checking normality, one-way ANOVA or Mann-Whitney tests were carried out for the inter-group balances

Evolución del pensamiento del profesor.

Investigar las dimensiones del pensamiento del profesor y su evolución a través de la carrera docente. Cinco tipos de muestras: estudiantes de primero de Magisterio, maestros sin ejercer, pedagogos de quinto de carrera, maestros novatos y maestros veteranos. Aplicación de cuestionarios en las aulas y envío aleatorio por correo a los prácticos. Cuestionarios, entrevistas, diarios, observación, estimulación del recuerdo. Técnicas paramétricas y no paramétricas fundamentalmente H de Kruskal Wallis y U de Mann Winney. Fuerte tasa de feminización, la formación teórica es muy importante, y a mayor tiempo, menor implicación y visión conservadora. Influencia de los factores ideológicos en menor medida que los teóricos.

Formaci??n del profesorado para el Espacio Europeo de Educaci??n Superior

Resumen tomado de la publicaci??n

Evaluaci??n de tres medidas de la sensibilidad en tareas de estimaci??n de magnitudes

Resumen tomado de la publicaci??n. Resumen tambi??n en ingl??s