Search results for " statistica"
showing 10 items of 2672 documents
IANUS: Comparative analysis
2002
Jointly with the application of IANUS model in the selected facilities, in WP4 Ambiente Italia has to produce an evaluation and comparison between different facilities and core indicators. The aim of this paper is to show collected data, computed indicators and comparison facilities throuh suggested indicator evaluation system.
Valutazione della bontà di una recente misura di ineguaglianza: uno studio di simulazione
2010
La misura di ineguaglianza proposta da Zenga (2007) per valutare il grado di concentrazione della ricchezza è valutata attraverso studi di simulazione. Tali studi riferiti anche come metodo di Monte Carlo, sono usati per investigare il comportamento di metodi statistici e misure sotto situazioni controllate, quando l’approccio analitico è complesso.
On the analysis of viability data: an example with Drosophila.
1990
Larval competition experiments involving two wild type and eight mutant strains of Drosophila melanogaster have been carried out following the substitution procedure proposed by Mather and Caligari (1981). Our main goal has been to compare the competitive abilities of two phenotypically indistinguishable strains (wild and Oregon-R) by means of their responses with eight different mutants. Prior to the analyses of viability data, we have studied the normalizing effect of several transformations in order to determine which was best suited for the analyses. The differences found among the five transformations tested and the untransformed data were not very great. The folded power transformatio…
A SIMPLE PARTICLE MODEL FOR A SYSTEM OF COUPLED EQUATIONS WITH ABSORBING COLLISION TERM
2011
We study a particle model for a simple system of partial differential equations describing, in dimension $d\geq 2$, a two component mixture where light particles move in a medium of absorbing, fixed obstacles; the system consists in a transport and a reaction equation coupled through pure absorption collision terms. We consider a particle system where the obstacles, of radius $\var$, become inactive at a rate related to the number of light particles travelling in their range of influence at a given time and the light particles are instantaneously absorbed at the first time they meet the physical boundary of an obstacle; elements belonging to the same species do not interact among themselves…
Internal Test Sets Studies in a Group of Antimalarials
2006
Topological indices have been applied to build QSAR models for a set of 20 an- timalarial cyclic peroxy cetals. In order to evalua te the reliability of the proposed linear models leave-n-out and Internal Test Sets (ITS) approaches have b een considered. The pro- posed procedure resulted in a robust and consensued prediction equation and here it is shown why it is superior to the employed standard c ross-validation algorithms involving multilinear regression models.
Monte Carlo evaluation of kerma in an HDR brachytherapy bunker
2004
In recent years, the use of high dose rate (HDR) after-loader machines has greatly increased due to the shift from traditional Cs-137/Ir-192 low dose rate (LDR) to HDR brachytherapy. The method used to calculate the required concrete and, where appropriate, lead shielding in the door is based on analytical methods provided by documents published by the ICRP, the IAEA and the NCRP. The purpose of this study is to perform a more realistic kerma evaluation at the entrance maze door of an HDR bunker using the Monte Carlo code GEANT4. The Monte Carlo results were validated experimentally. The spectrum at the maze entrance door, obtained with Monte Carlo, has an average energy of about 110 keV, m…
I grandi numeri dell'istruzione secondaria e terziaria
2021
This works deals with the “big” changes occurred in the upper secondary (high school) and tertiary education in Italy in the last 20 years. It can be divided into three steps: 1. High school, 2. High school-university transition; 3. University enrollment and careers. High school. With reference to upper secondary education, the educational attendance and attainment have reached very good results in the last 60 years, as 90% of the young students get nowadays a high school diploma with some differences in favor of the northern-central regions of the country. Moreover, there have been profound changes in the choices relating to the type of high school: a decrease of the students attending the…
Women's career discrimination in the Italian Academia in the last 20 years
2021
We examine discrimination against women in Italian universities in terms of career advancements for the last 20 years. Data is taken from the MUR archive. Two points are examined: the transition time from assistant professor to associate professor; and the transition time from associate professor to full professor.
Job Satisfaction among Primary School Personnel
2016
International audience; This article analyzes the job satisfaction of primary school teachers inMadagascar. Based on the estimation of multilevel models, low wages and problems getting paid, job insecurity, lack of in-service training, high pupil-teacher ratios, and lack of basic infrastructure and teaching materials are identified as the main reasons for dissatisfaction. Principals' control of teachers' activities also adversely affects satisfaction, suggesting that, in Malagasy schools, neither school directors nor teachers have succeeded in adopting organizational cultures based on cooperation among their members. These results are likely to stimulate debates on educational policy, both …
Nature et impacts des effets spatiaux sur les valeurs immobilières : le cas de l'espace urbanisé francilien
2013
International audience