Influence analysis on discriminant coordinates

Discriminant analysis (DA), particularly Discriminant Coordinates (DC), is broadly applied in the scientific literature and included in many statistical software packages. DC is used to analyze biomedical data, especially for differential diagnosis on the basis of laboratory profiles. Papers handling influence analysis in DA can be found in the literature; however this topic has been scarcely touched upon in DC. In this paper the case-deletion approach is followed to introduce a perturbation in the data and influence measures are proposed to assess the effect on three statistics of interest: the transformation matrix, canonical directions and configuration of the sample centroids.Ministerio de Ciencia y Tecnologí

The ACS Fornax Cluster Survey. VI. The Nuclei of Early-Type Galaxies in the Fornax Cluster

The Advanced Camera for Surveys (ACS) Fornax Cluster Survey is a Hubble Space Telescope program to image 43 early-type galaxies in the Fornax cluster, using the F475W and F850LP bandpasses of the ACS. We employ both 1D and 2D techniques to characterize the properties of the stellar nuclei in these galaxies, defined as the central "luminosity excesses" relative to a Sersic model fitted to the underlying host. We find 72+/-13% of our sample (31 galaxies) to be nucleated, with only three of the nuclei offset by more than 0.5" from their galaxy photocenter, and with the majority of nuclei having colors bluer than their hosts. The nuclei are observed to be larger, and brighter, than typical Fornax globular clusters, and to follow different structural scaling relations. A comparison of our results to those from the ACS Virgo Cluster Survey reveals striking similarities in the properties of the nuclei belonging to these different environments. We briefly review a variety of proposed formation models and conclude that, for the low-mass galaxies in our sample, the most important mechanism for nucleus growth is probably infall of star clusters through dynamical friction, while for higher mass galaxies, gas accretion triggered by mergers, accretions and tidal torques is likely to dominate, with the relative importance of these two processes varying smoothly as a function of galaxy mass. Some intermediate-mass galaxies in our sample show a complexity in their inner structure that may be the signature of "hybrid nuclei" that arose through parallel formation channels.Comment: 34 pages, 27 figures, accepted for publication in ApJ

Reviews: Sedimentary Features of Flysch and Greywackes; Submarine Geology and Geophysics

Hurbert C. Skinner\u27s review of Sedimentary Features of Flysch and Greywackes and Submarine Geology and Geophysics

Application of the Overview, Design concepts and Details (ODD) : protocol to describe the DEMOCARE Agent Based Model

This work forms part of the R & D project "Who will I live with and who will take care of me?" (CSO2014-60113-R) co-directed by Daniel Devolder and Jeroen Spijker and financed by the Spanish Ministry of Economy and Competitiveness. Jeroen Spijker also receives funding under the "Ramón y Cajal" program (RYC-2013-14851) and Pilar Zueras under the "Juan de la Cierva" program (FJCI-2015-27107), financed by the same Ministry. Financial support was also received from the Catalan Government under the CERCA Program.In this working paper we apply the standard ODD (Overview, Design concepts and Details) Protocol to describe a social simulation model that we have called DEMOCARE. The DEMOCARE model is an example of integrating microsimulation of kinship with agent-based modelling (ABM) that has been developed to study the dynamics of the demand and supply of elderly (65+) care in Spain at the family level. Our research question is to determine the extent to which the request for assistance can be covered by the time that family members (spouse, children, brothers and sisters, step-children) that we reconstruct in the model have available, or If it is necessary to resort (partially or totally) to professionals from outside the family. The model considers demographic change by means of comparing five different Spanish generations with very different levels of fertility and mortality and uses observed data on the probability of being dependent, educational differences and labour force participation.En aquest document de treball s'utilitza el protocol estàndard ODD (Overview, Design concepts and Details) per descriure un model de simulació social que hem anomenat DEMOCARE. El model DEMOCARE és un exemple d'integració de la microsimulació del parentiu amb un model basat en agents (ABM) que s'ha creat per estudiar la dinàmica de la demanda i l'oferta dels serveis d'atenció prestats a persones dependents majors (65+), a Espanya, per persones de l'entorn familiar. La nostra pregunta d'investigació busca determinar la mesura en què la demanda d'assistència pot quedar satisfeta amb el temps disponible dels membres de la família (esposa, fills, germans, fillastres) que reconstruïm en el model, o bé si és necessari recórrer (parcialment o total) a professionals externs a la família. El model té en compte els canvis demogràfics, mitjançant la comparació de cinc generacions espanyoles diferents, amb nivells molt diversos de fecunditat i mortalitat, i utilitza dades observades per la probabilitat de ser dependent, les diferències en els nivells d'educació així com la relació amb l'activitat laboral.En este documento de trabajo se utiliza el protocolo estándar ODD (Overview, Design conceptos and Details) para describir un modelo de simulación social que hemos llamado DEMOCARE. El modelo DEMOCARE es un ejemplo de integración entre la microsimulación del parentesco y un modelo basado en agentes (ABM) que se ha creado para estudiar la dinámica de la demanda y la oferta de los servicios de atención prestada a personas dependientes mayores (65+), en España, por personas del entorno familiar. Nuestra pregunta de investigación busca determinar la manera en que la demanda de asistencia se puede satisfacer con el tiempo disponible de los miembros de la familia (esposa, hijos, hermanos, hijastros) que reconstruimos en el modelo, o bien si es necesario recurrir (parcial o totalmente) a profesionales externos a la familia. El modelo tiene en cuenta las tendencias sociodemográficas, mediante la comparación de cinco generaciones españolas diferentes, con niveles muy distintos de fecundidad y mortalidad, y utiliza datos observados para la probabilidad de ser dependiente, las diferencias en los niveles de educación así como la relación con la actividad laboral