Search results for "Variables"

The Impact of the Direct Participation of Workers on the Rates of Absenteeism in the Spanish Labor Environment.

2020

The aim of this research was to study the relationship between the different levels of direct participation of workers (passive, consultative or active-delegated) in risk prevention management with the levels of absenteeism in Spain. To this end, a transversal study was carried out using microdata from the Second European Survey of Companies on New and Emerging Risks (ESENER-2-Spain, 2014) with a master population of 3162 work centres. A multinomial logistic regression model was carried out, with the dependent variable being the levels of absenteeism and the independent variables, the participation indicators and preventive management, calculating the adjusted odds ratio (aOR) between all t…

THE DEVELOPMENT OF ADOLESCENTS’ SELF-CONCEPT OF ABILITY THROUGH GRADES 7-9 AND THE ROLE OF PARENTAL BELIEFS

2016

This study examined the development of adolescents’ self-concept of ability in mathematics and literacy during secondary school, and the role that mothers’ and fathers’ beliefs concerning their child’s abilities play in this development. Also examined was whether the role of mothers’ and fathers’ beliefs about their adolescent child’s ability in mathematics and literacy differs according to the adolescent’s gender and level of performance. A total of 231 adolescents and their mothers and fathers were followed up across secondary school. The results showed, first, that adolescents’ self-concept of ability declined slightly from grade 7 to grade 9 in both mathematics and literacy. Second, mot…

Disposição ao pensamento crítico, nível acadêmico, gênero e resolução de problemas no ensino médio

2021

Resumen El propósito de este estudio fue investigar la posible influencia de la disposición hacia el pensamiento crítico, el nivel académico y el género (variables independientes) sobre el desempeño en resolución de problemas de estudiantes de secundaria (variable dependiente). Han participado 114 estudiantes de educación secundaria españoles, 55 chicos y 59 chicas, de 3º y 4º de ESO y de 1º de Bachillerato (9º, 10º y 11º grado, respectivamente). A todos ellos se les ha administrado un cuestionario sobre disposición hacia el pensamiento crítico y una prueba de resolución de problemas (un problema de las pruebas PISA). De la matriz de correlaciones producto-momento de Pearson entre variables…

The effects of self‐efficacy, hope, and engagement on the academic achievement of secondary education in the Dominican Republic

2019

A Perspective on Aging in Rotifers

1980

Most research on aging in rotifers has been performed with populations, not with individuals. As a consequence, the dependent variable in these studies is usually either mean lifespan or rate of survivorship. After a brief consideration of the literature published since the last major review (King, 1969), the results of a series of experiments are presented. Males and females of three genetically distinct clones of Brachionus plicatilis were used for a factorial life table analysis at three different temperatures. The results of these experiments indicate several potential problems in using populations to study the aging process of individuals. These problems derive from the fact that lifes…

The space H(Ω,(zj)) of holomorphic functions

2008

Abstract Let Ω be a domain in C n . Let H ( Ω ) be the linear space over C of the holomorphic functions in Ω, endowed with the compact-open topology. Let ( z j ) be a sequence in Ω without adherent points in Ω. In this paper, we define the space H ( Ω , ( z j ) ) and some of its linear topological properties are studied. We also show that, for some domains of holomorphy Ω and some sequences ( z j ) , the non-zero elements of H ( Ω , ( z j ) ) cannot be extended holomorphically outside Ω. As a consequence, we obtain some characterizations of the domains of holomorphy in C n .

On the order of indeterminate moment problems

2013

For an indeterminate moment problem we denote the orthonormal polynomials by P_n. We study the relation between the growth of the function P(z)=(\sum_{n=0}^\infty|P_n(z)|^2)^{1/2} and summability properties of the sequence (P_n(z)). Under certain assumptions on the recurrence coefficients from the three term recurrence relation zP_n(z)=b_nP_{n+1}(z)+a_nP_n(z)+b_{n-1}P_{n-1}(z), we show that the function P is of order \alpha with 0<\alpha<1, if and only if the sequence (P_n(z)) is absolutely summable to any power greater than 2\alpha. Furthermore, the order \alpha is equal to the exponent of convergence of the sequence (b_n). Similar results are obtained for logarithmic order and for more ge…

Selection of the Best Subset of Variables in Regression and Time Series Models

2009

The problem of variable selection is one of the most pervasive model selection problems in statistical applications. Often referred to as the problem of subset selection, it arises when one wants to model the relationship between a variable of interest and a subset of potential explanatory variables or predictors, but there is uncertainty about which subset to use. Several papers have dealt with various aspects of the problem but it appears that the typical regression user has not benefited appreciably. One reason for the lack of resolution of the problem is the fact that it is has not been well defined. Indeed, it is apparent that there is not a single problem, but rather several problems …

Nature log-analytique du volume des sous-analytiques

2000

Using a preparation theorem for subanalytic functions and Lipschitz stratification for compact subanalytic sets we prove that volumes of slices of globally subanalytic sets and density have a log-analytic nature. We also prove that the set of parameters for which the volume of fiber is finite is globally subanalytic.

Genetic and morphologic diversity of European fan palm (Chamaerops humilisL.) populations from different environments from Sicily

2014

Chamaerops humilis is decreasing in abundance in Mediterranean Europe, which has induced the European community to call for its protection in Special Areas of Conservation. However, information about its genetic and morphological variability, which is crucial to the development of any conservation strategies, is insufficient. The present study aimed to investigate the genetic and morphological variability of C. humilis in Sicily, which was selected as a model because of the high number of dense populations. The relationships between morphological traits and climatic variables were studied to highlight patterns of adaptation to the environment, along with the genetic similarity among the pop…