Social security reform in Latin America: policy challenges

Over the last decade Latin American countries have served as the world's laboratory for pension systems based on individual retirement savings accounts. Some countries have adopted defined-contribution individual accounts as a replacement for state-run pension systems; other countries have embraced mixed systems of have made individual accounts optional and supplementary. This article outlines some of the most significant elements of recent Latin American pension reforms and examines some of the most serious policy challenges faced by governments implementing the new systems of individual accounts, including the need to reduce administrative costs, limit evasion, incorporate new categories of workers into the system, and improve competition in the pension fund industry. The authors conclude that there is no single Latin America model, and that reform itself has been and will continue to be an incremental process.     

Modeling with Mixtures of Linear Regressions

Consider data (x ₁,y ₁),...,(x _n,y _n), where each x _i may be vector valued, and the distribution of y _i given x _i is a mixture of linear regressions. This provides a generalization of mixture models which do not include covariates in the mixture formulation. This mixture of linear regressions formulation has appeared in the computer science literature under the name Hierarchical Mixtures of Experts model.This model has been considered from both frequentist and Bayesian viewpoints. We focus on the Bayesian formulation. Previously, estimation of the mixture of linear regression model has been done through straightforward Gibbs sampling with latent variables. This paper contributes to this field in three major areas. First, we provide a theoretical underpinning to the Bayesian implementation by demonstrating consistency of the posterior distribution. This demonstration is done by extending results in Barron, Schervish and Wasserman (Annals of Statistics 27: 536–561, 1999) on bracketing entropy to the regression setting. Second, we demonstrate through examples that straightforward Gibbs sampling may fail to effectively explore the posterior distribution and provide alternative algorithms that are more accurate. Third, we demonstrate the usefulness of the mixture of linear regressions framework in Bayesian robust regression. The methods described in the paper are applied to two examples.     

Chief Executive Officer Behavior: The Catalyst for Strategic Alignment

Organizations facing the need for significant change must determine both adirection for change and a means to realize the strategy. Implementing astrategy for change is dependent upon aligning organizational parametersproperly at the system level: structure, culture, training and development,recruitment and hiring, resource allocation, leadership, information systems,reward systems, coordination mechanisms, and control systems. The chiefexecutive officer must be the catalyst for strategic alignment. Four clustersof behavior are particularly important for the chief executive officer toexhibit in implementing strategic change: Communication, StrategicInteraction, Resource Utilization, and Leadership. Specific behaviors withinthese clusters are identified. The chief executive officer has an importantrole to play as the catalyst for strategic alignment, but the ultimate purposeof that role is to make it possible for the organization to see itself as abroader community responsible for the long-term success of the organization.     

Refugee Women in Europe: Some Aspects of the Legal and Policy Dimensions

This article presents an overview of the legal and policy issues affecting refugee and asylum-seeking women in European host societies. First, it explores the unique types of persecution experienced by women and shows that the asylum determination process, along with the status of women relative to men, mitigates against the effective protection of women. The legal basis for asylum, the evidential requirements and the procedural norms all reduce the protection which is likely to be conferred upon asylum-seeking women. Second, the article provides an overview of responses to female refugees and asylum-seekers in European countries of asylum. Although there are differences between countries, there is also a large degree of uniformity. For example, there is a lack of recognition and understanding of the diversity and the range of experiences which refugees bring with them, including different social and cultural norms. Moreover, European policies do not provide special provisions to facilitate the settlement of refugee women and instead place barriers to their social and economic participation. Third, the article examines policies for family reunion in different countries and shows that such unfavourable and unsympathetic policies mitigate against the settlement of refugee women. Finally, the article argues that if refugee and asylum-seeking women are to have their cases recognized and to be successfully settled, then there needs to be a complete rethink of legislation and policy in Europe.     

Negotiating control and achieving performance in international joint ventures: A conceptual model

Adapting well-established organization theories to international joint ventures (IJVs), this paper develops an overarching theoretical model of the determinants and effects of parent control of IJVs from an interpartner bargaining power perspective. Drawing upon power dependence, transaction costs, and agency theories, we argue that the relative bargaining power between IJV partners serves as the key determinant of control structure, and that control exerts a direct effect on the venture's performance. In addition, government influence and interpartner working relationship are critical factors that complicate the linkage between control and performance but may help to explain past conflicting results. Propositions regarding these relationships are formed for future empirical test, and implications and directions for future research are provided.     

Religiosity and preferences for life-prolonging medical treatments in African-American and white elders: a mediation study

Research on end-of-life treatment preferences has documented robust racial differences, with African-Americans preferring more life-prolonging treatment than Whites. Although little research has attempted to explain these racial differences systematically, speculation has centered on religiosity. We examined a dimension of religiosity frequently invoked in end-of-life research-guidance by God's will-as a potential mediator of racial differences in such treatment preferences. Three hundred African-American and White men and women aged 60 or older participated in a 35-minute telephone interview that elicited preferences for four common life-prolonging treatments in each of nine health scenarios. The questionnaire included the five-item God's will (GW) scale, a health conditions checklist, a depression measure, and sociodemographic questions. GW mediated racial differences at least partially for most treatments and in most health scenarios. Implications are discussed for understanding end-of-life treatment preferences and why races tend to differ.     

A constrained optimum experimental design problem for model discrimination with a continuously varying factor

We present the theoretical background and the numerical procedure for calculating optimum experimental designs for non-linear model discrimination in the presence of constraints. The design support points consist of two kinds of factors: a continuous function of time and discrete levels of other quantitative factors. That is, some of the experimental conditions are allowed to continually vary during the experimental run. We implement the theory in a chemical kinetic model discrimination problem.     

Infants born preterm and infants born full-term generate more selective leg joint movement during the scaffolded mobile task

Infants born very preterm (PT), prior to 32 weeks gestation, are at increased risk of developing cerebral palsy. Children with spastic cerebral palsy have impaired selective leg joint movement, which contributes to lifelong walking limitations. We investigated whether infants born PT generated more selective hip–knee joint movement (e.g., hip flexes as knee extends) while participating in a scaffolded mobile task. Infants born PT and infants born full-term (FT) at 4 months corrected age participated in a scaffolded mobile task for 2–3 consecutive days. The scaffolded mobile task required infants to raise their legs vertically over a virtual threshold. Three threshold heights (low, middle, and high) were used to test whether the middle and high heights encourage infants to move their legs more selectively. Fifteen infants born FT learned the task and showed more selective hip–knee movement at each of the three threshold heights on the day that they learned, compared with their baseline spontaneous kicking. Thirteen infants born PT learned the task and showed more selective hip–knee movement on their learning day, but only when the middle and high thresholds were used. The results show that the scaffolded mobile task effectively encouraged infants to generate more selective hip–knee joint movement.