Tree-structured subgroup analysis for censored survival data: Validation of computationally inexpensive model selection criteria

The performance of computationally inexpensive model selection criteria in the context of tree-structured subgroup analysis is investigated. It is shown through simulation that no single model selection criterion exhibits a uniformly superior performance over a wide range of scenarios. Therefore, a two-stage approach for model selection is proposed and shown to perform satisfactorily. Applied example of subgroup analysis is presented. Problems associated with tree-structured subgroup analysis are discussed and practical solutions are suggested.     

Marginal and hazard ratio specific random data generation: Applications to semi-parametric bootstrapping

Cox's partial likelihood for censored time-to-event data can be interpreted as a permutation probability, whereby covariate values are permuted to the observed times-to-event and censoring times. This interpretation facilitates a simple method for jointly generating times-to-event and covariate tuples with considerable flexibility, including time dependence of the hazard ratio and specification of both the marginal time-to-event and covariate distributions. This interpretation also facilitates a method for semi-parametric bootstrapping of hazard ratio estimators.     

Learning technologies at the service of higher education: global trends and local Israeli opportunities

This paper provides an overview of global trends in e-Learning and opportunities opened by harnessing learning technologies at the service of the Israeli higher education. The introduction of innovative learning technologies is examined in light of an organizational change. A series of substantial issues should be taken into account to successfully manage the change. Among these are: rethinking of academic learning and instruction, redefining the role of the teachers and the students, decoupling the learning materials and the learning process, new approaches to student assessment and program evaluation, and instituting a well thought out organizational plan including a support center. The above-mentioned issues guided the introduction of a recent call for project proposals for the integration of technologies into Israeli higher education. The main principles, criteria and results of this call are described.     

Ensuring units invariant slack selection in radial data envelopment analysis models,and incorporating slacks into an overall efficiency score

This paper introduces a new methodology ensuring units invariant slack selection in radial DEA models and incorporating the slacks into an overall efficiency score. The CCR and BCC models are units invariant in their radial component, but not in their slack component, thus changing the units of measurement of one or more variables can change the models' solution. The proposed Full Proportional Slack (FPS) methodology improves the slack selections of the CCR and BCC models by producing slack selections that (a) are units invariant, thus producing fully units invariant models, (b) maximize the relative improvements represented by the slacks, and not their values, and (c) measure the full slacks that need to be removed from their corresponding variables. The FPS methodology is a fully oriented methodology first maximizing the improvements in the variables on the side of the orientation of the model. The Proportional Slack Adjusted (PSA) methodology incorporates the FPS slacks into an overall efficiency score, making it easier to interpret and use the results. The FPS and PSA methodologies are illustrated using an input oriented VRS Loan Quality DEA model with data from the retail branch network of one of Canada's largest banks.     

Parent and Sibling Influences on the Quality of Children's Conflict Behaviours across the Preschool Period

Parent and sibling influences on children's development of conflict management strategies were examined. Data consist of naturally occurring, in‐home sibling disputes of 37 families at two time points. The siblings were approximately two and four years old at Time 1, and four and six years old at Time 2. Parents' and children's use of conflict strategies that reflect proactive autonomy assertions such as opposition and verbal and physical power were the focus of the current study. Results suggest that parents and siblings play an important role in shaping children's conflict behaviours over time. For instance, parents' reliance on unelaborated opposition to the child, and older siblings' increased use of physical power predicted decreases in younger siblings' ability to assert themselves during conflict. In addition, increased proportions of opposition from a younger sibling was associated with the older siblings using less verbal aggression and using more mature conflict strategies such as justifying their own behaviour to their younger sibling. As sibling conflict is a salient child rearing concern for parents, practical implications are discussed.     

The Gendered State of Business: Gender,Enterprises and State in Israeli Society

Whether the state provides different entrepreneurial opportunities for women and men and how is an issue rarely discussed in the growing literature concerning gender and organizations. Integrating gender and organization literature with political theories of the state, this paper compares women's entrepreneurship in one setting (Israeli society) across two time periods: before and after the foundation of a sovereign state. Our analysis identifies three manifestations of the gendering state through which it moulds business opportunities of men and women entrepreneurs. We examine how these manifestations: the delegation of economic actors, managing interactions between individuals and institutions, and administering a bureaucracy, shape access to capital and the structure of networks. The article contributes to the existing scholarship by extending the understanding of direct and indirect influence of the state on the reproduction of the image of the ideal entrepreneur and on gender differences in entrepreneurial activity.     

The Saving for Every Child Program in Israel: an overview of a universal asset-building policy

ABSTRACT

In 2017, the Israeli government implemented a universal child development account programme – the Saving for Every Child Program (SECP) – which establishes a personal savings account for every Israeli child and provides monthly deposits until the child turns 18. The SECP has the potential to provide substantial assets when children reach adulthood, but the benefits depend on parents’ investment choices. The unique programme’s nature presents opportunities to learn from its implementation. This paper provides a comprehensive overview of the SECP, its legislative history, early findings from its implementation, and recommendations that may improve programme participation and outcomes across population groups.     

Listening to 'life knowledge': a new research direction in poverty studies

This article points to a current research direction in poverty studies, which explores the knowledge of people living in poverty. The article examines three studies from the USA, Europe and Israel which give voice to the 'life knowledge' of people living in poverty regarding different aspects of their lives. Through these examples, the article examines the potential contribution of 'life knowledge', possessed by people who are welfare-reliant, to the body of knowledge concerning welfare policy. Knowledge of this sort challenges standard preconceptions about the ways in which people cope with hardship and about the ways in which assistance might be given. The article discusses the ways in which 'life knowledge' can be recognised as such and investigated, and how it might contribute to the formation of public policy.