Laws of the iterated logarithm and large deviations for a class of diffusionl processes

We use the martingale approach to study large deviations and laws of the iterated logarithm for certain multidimensional diffusion processes. The criteria for the validity of these properties are expressed in terms of averaging properties of the coefficients of the infinitesimal generator. In particular we apply our results to diffusion processes with random coefficients.     

The Effect of Gender Policies on Fertility: The Moderating Role of Education and Normative Context

In this paper, we aim to assess the extent to which individual-level completed fertility varies across contexts characterized by policies supporting different gender division of labor models. We examine key labor market and care policies that shape gender relations in households and in the public domain. We also consider the role of gender norms, which can act as both a moderator and a confounding factor for policy effects. We hypothesize that, by facilitating role compatibility and reducing the gendered costs of childrearing, policies that support gender equality lead to an increase in fertility levels and to a reduction in fertility differentials by the level of education. Using individual-level data from the European Union Survey on Income and Living Conditions for 16 countries, combined with country-level data, we analyze completed fertility through multilevel Poisson’s models. We find that the national level of childcare coverage is positively associated with fertility. Family allowances, prevalence of women’s part-time employment and length of paid leaves were also found to be positively associated with completed fertility, though the associations were not statistically significant. These variables show a significant positive pattern according to education. A high number of average working hours for men are negatively associated with completed fertility and show a strong negative pattern by educational level. The prevalence of gender-egalitarian norms is highly predictive of fertility levels, yet we found no consistent evidence of a weaker association of gender-equality policies in countries where egalitarian values are less prevalent.     

Index of Authors Volume 51

Authors Index

Index of Authors Volume 51     

From airy-fairy ideas to concrete realities: The case of shared farming

This article provides a case study of environmental and social change leadership. Dan Wiens has been the key leader of the widely acclaimed Shared Farming movement, introducing an alternative agrifood system that is environmentally friendly and socially just. Key attributes that characterize Dan's leadership include: a deep-rooted sense of mission, an ability to articulate a philosophy espoused by others, a need to empower others, and a sense of integrity that comes from putting values into action.     

Validity and the Consequences of Test Interpretation and Use

The vast majority of measures have, at their core, a purpose of personal and social change. If test developers and users want measures to have personal and social consequences and impact, then it is critical to consider the consequences and side effects of measurement in the validation process itself. The consequential basis of test interpretation and use, as introduced in Messick’s (Educational measurement, Macmillan, New York, pp. 13–103, 1989) progressive matrix model of unified validity theory, has been misunderstood by many measurement experts, test developers, researchers, and practitioners. The purposes of this paper were to (a) review Messick’s unified view of validity and clarify his consequential basis of test interpretation and use, (b) discuss the kinds of questions evoked by value implications and social consequences and their role in construct validity and score meaning, (c) present a reframing of Messick’s model and a new model of unified validity and validation, (d) bring the concept of multilevel measures under the same validation umbrella as individual differences measures, and (e) offer some thoughts and directions for more explicit consideration of value implications, intended social consequences, and unintended side effects of legitimate test interpretation and use. This paper has implications for the interpretation, use, and validation of both individual differences and multilevel measures in education, psychology, and health contexts.     

Habitat- and matrix-related differences in species diversity and trait richness of vascular plants,Orthoptera and Lepidoptera in an urban landscape

Urban growth is considered to be a major driver of environmental change. Urbanisation can affect urban biodiversity in different ways. So far, most studies focused on the impact of urbanisation on single taxa in one habitat type. In this study, we used data of species inventories and GIS-based landscape elements to examine the effects of habitat size and landscape composition on the species diversity of three taxonomic groups (vascular plants, Orthoptera and Lepidoptera) in meadows and ruderal sites in the urban region of Basel, Switzerland. We also related the responses of three species traits (body size, dispersal ability and food specialisation) to habitat size in Orthoptera and Lepidoptera. We found that species of the different taxonomic groups differed in their response to habitat size and landscape composition both in meadows and ruderal sites depending on the traits examined. The species richness of Orthoptera and Lepidoptera was positively related to meadow size but not to the size of ruderal sites, while the opposite was true for plants. For Lepidoptera in ruderal sites, the percentage cover of ruderal area in the closer surroundings was a better predictor of species richness than habitat size per se. To sustain high levels of urban biodiversity, we recommend that urban planners develop adequate management strategies to satisfy the different requirements of various taxonomic groups and to increase the quality of green sites surrounding the target habitat.     

TIC et gains de productivité en Afrique subsaharienne

Les auteurs examinent les effets des TIC sur la productivité à partir d'un échantillon de 43 pays d'Afrique subsaharienne. Ils concluent que le développement des téléphonies fixe et mobile stimule la croissance de la productivité dans un processus à rendements croissants, confirmant l'existence d'un effet de réseau. Ainsi, la multiplication par deux du taux de pénétration des téléphonies fixe et mobile augmente les gains de productivité de 0,12 à 0,15 et 0,05 pour cent environ, respectivement. En outre, dans la région, l'accès facilité aux services bancaires et financiers serait l'un des vecteurs de l'effet de la téléphonie mobile sur la productivité.     

Islamic Social Activism,Globalization and Social Change: A Case Study of Hajji İlgar İbragimoğlu and the Cüma Ehli in Baku,Azerbaijan

Substantial research and reporting have been conducted on the position and dynamics of religion in the historically and culturally Muslim parts of the old USSR. Yet the question whether the reported increase in religious identification and practice in some sectors of society has led to the emergence of a faith-based social sector remains relatively under-examined. Through a detailed case study of Hajji ?lgar ?bragimo?lu and the Cüma Ehli in Baku, Azerbaijan, this article discusses the social base and modus operandi of Baku's new Islamic social activists, and sets this against the social and ideological changes and shifts that have occurred since the country and its society were confronted with and integrated into the current phase of globalization.     

Regular provision of grandchild care and participation in social activities

Against the background of rapid population ageing, studying social participation in later life is of particular relevance within the framework of active ageing. Although caring for grandchildren has taken a central role for older persons due to unprecedented overlap between grandparents’ and their grandchildren’s lives, whether the relationship between grandparental childcare and social activities is characterised by cumulation or competition remains under-explored. Grandparental childcare may increase the purpose in life for grandparents, stimulating their social participation, or it may impose time and energy constraints on it. This study aims to assess the effect of providing grandchild care on participation in social activities for people aged 50–85 in Europe. Using an instrumental variable approach on data from the Survey of Health, Ageing and Retirement in Europe, we find no significant negative effects of grandchild care on engagement in at least one social activity. However, regular provision of grandchild care has a significant negative effect on the number of activities in which grandmothers participate. When considering the activities separately by type we also find, for grandmothers only, a negative effect on volunteering, engagement in educational or training courses and participation in political or community-related organisation.     

An anthropometric survey using digital photogrammetry: a case study in Recife, Pernambuco, Brazil

This study was carried out in a partnership with the Federal University of Pernambuco and the Faculty of Human Motricity of the Technical University in Lisbon (Portugal). The aim of the study was the measurement of human body segments throughout the digital photogramety, comparing and analysing data into Recife sample and to validate the Digital System as anthropometric survey tool. The result of the analysis has introduced: Data from the sample; Data by age; Data by Sex; Data by ethnicity; Data by region of birth; Difference of data from population individually. Besides to prove the true efficiency of the software.