Search results for "Statistica"

Biometric analysis of Brachionus plicatilis ecotypes from Spanish lagoons

1983

Univariate comparisons and several multivariate statistical analyses have been performed to study the morphometric variability of B. plicatilis. Both laboratory clones kept under constant conditions and natural populations from different Spanish lagoons and different times of the year have been compared. The results show that not only size, but also allometric coefficients are influenced by environmental factors. However, an important genetic component in the variation of shape and size has been visualized. A clear North-South ordination of the populations of the different lagoons and an important dispersion between their summer populations as well as great differences due to seasonal varia…

Accumuler le capital humain tout au long de la vie: Quels facteurs prédictifs de la participation à la formation permanente?

2003

This article addresses the main predictors of adult education, using statistical methods different from those generally used by social science researchers. Its aim is twofold. First, it seeks to explain in a simple and comprehensible manner the methodological value of these methods (in relation to the use of structural models); secondly, it demonstrates the concrete usefulness of these methods on the basis of a recent piece of research on the data from the International Adult Literacy Survey (IALS).

Inequalities in student performances in the Italian universities

2023

Students' views of assessment in the finnish gymnasium

1980

Volume di attività operatoria per medico e tempestività di esecuzione di intervento chirurgico a seguito di frattura del collo del femore nell’anzian…

2013

Introduzione: La valutazione della qualità dell’assistenza rappresenta un ambito di investigazione di primaria importanza. Nell’ambito delle diverse dimensioni che caratterizzano la qualità complessiva dell’assistenza sanitaria, uno degli elementi cruciali è dato dall’efficacia tecnica dei trattamenti. È noto come le misure di efficacia dei trattamenti possano essere costruite relativamente a diversi aspetti tra i quali la dotazione di personale e i volumi di attività. Obiettivo: Il presente studio ha l’obiettivo di analizzare la relazione tra uno degli indicatori di processo ad oggi in uso nell’ambito della regione Sicilia per la valutazione della performance aziendale, qual è la tempestiv…

The Limits of Ego Depletion

2019

Abstract. Evidence on the existence of the ego depletion phenomena as well as the size of the effects and potential moderators and mediators are ambiguous. Building on a crossover design that enables superior statistical power within a single study, we investigated the robustness of the ego depletion effect between and within subjects and moderating and mediating influences of the ego depletion manipulation checks. Our results, based on a sample of 187 participants, demonstrated that (a) the between- and within-subject ego depletion effects only had negligible effect sizes and that there was (b) large interindividual variability that (c) could not be explained by differences in ego depleti…

Electromagnetic Form Factors in the Time Like Domain

2008

The electromagnetic form factors in the time like domain can be accessed by the reaction p ¯ p → e + e − or its time inversed process. Despite a long standing experimental effort to determine these form factors, the precision in the knowledge of the ratio | G E | / | G M | ist still very poor in the time like domain. All world data suffer from limited statistics and therefore have used the hypothesis of | G E | = | G M | in order to extract a value for | G M | . While there is no theory argument for this hypothesis, recent JLAB data from polarisation transfer in elastic electron scattering show, that this hypothesis does not hold. Only a few data points allow the determination of | G E | / …

On the annual modulation signal in dark matter direct detection

2012

We derive constraints on the annual modulation signal in Dark Matter (DM) direct detection experiments in terms of the unmodulated event rate. A general bound independent of the details of DM distribution follows from the assumption that the motion of the earth around the sun is the only source of time variation. The bound is valid for a very general class of particle physics models and also holds in the presence of an unknown unmodulated background. More stringent bounds are obtained, if modest assumptions on symmetry properties of the DM halo are adopted. We illustrate the bounds by applying them to the annual modulation signals reported by the DAMA and CoGeNT experiments in the framework…

Initial state radiation experiment at MAMI

2014

In an attempt to contribute further insight into the discrepancy between the Lamb shift and elastic scattering determinations of the proton charge radius, a new experiment at MAMI is underway, aimed at measuring proton form-factors at very low momentum transfers by using a new technique based on initial state radiation. This paper reports on the conclusions of the pilot measurement performed in 2010, whose main goal was to check the feasibility of the proposed experiment and to recognize and overcome any obstacles before running the full experiment. The modifications to the experimental apparatus are then explained which significantly improved the quality of data collected in the full scale…

NUCLEAR MAGNETIC ORDER, USE OF SPIN DEPENDENT AMPLITUDES

1993

The use of the spin dependent part of the nuclear scattering length gives access to neutron scattering to the field of nuclear magnetism. This paper presents the theoretical and experimental background for such experiments. The available results on nuclear order will be reviewed and put if possible in the larger frame of many body physics. The possibilities of using nuclear magnetism for new applications or the improvement of scattering techniques will be stressed as well.