Moderate wage increases and flexible labour contracts to protect employment in Colombian manufacturing

Based on conditional and unconditional demands for labour, we exploit the variations of real minimum wage across manufacturing subsectors to present evidence that this variable affects formal employment. The long-term elasticity of labour demand to the minimum wage is around –0.7. Accordingly, increases in the minimum wage lead to job losses for unskilled labour, mainly in plants with fewer than 100; thus, small increases in the minimum wage are desirable to protect employment. Labour demand is highly cyclical: the output elasticity is about 1.7. Thus, some flexibility in labour contracts is desirable to reduce the link between employment and variation of plants’ sales. Open-ended labour contracts might allow reductions of the nominal wage rather than inducing job losses during periods of severe slumps, as has happened during the COVID-19 pandemic.     

Subset selection of superior populations when the number of populations is large

The situation where k populations are partitioned into one inferior group and one superior group is considered. The statistical problem is to select a random size subset of superior populations while trying to avoid including any inferior populations. A selection procedure is assumed to satisfy the condition that the probability of selecting at least one superior population is bounded below by P¹<1. The performance of a procedure is measured by the probability of including an inferior population.The asymptotic performance, as k→∞ of Gupta's traditional maximum type procedure ψ^G is considered in the location-model. For normally distributed populations, ψ^G turns out to be asymptotically optimal, provided the size of the inferior group does not become infinitely larger than the size of the superior group.     

Comparing three alternative types of employment with permanent full-time work: How do employment contract and perceived job conditions relate to health complaints?

Previous research has found that alternative employment arrangements are associated with both impaired and improved well-being. Since such inconsistencies are likely to derive from the type of employment contract as well as the characteristics of the job, this paper compares permanent full-time work with forms of alternative employment (permanent part-time, fixed-term and on-call work) in order to investigate how different employment contracts and perceptions of job conditions relate to individual well-being. This study contributes to the literature by addressing several questions. Different forms of alternative employment are distinguished and individual background characteristics that might be intertwined with the employment contract are controlled for. Moreover, the scope of this study extends to the effects of perceived job conditions, and possible interactive effects with type of employment are tested. Analyses of questionnaire data from 954 Swedish healthcare workers show that perceptions of the job (job insecurity, job control and demands), but not the type of employment contract, predicted health complaints. However, type of employment interacted with perceptions of job insecurity, in that insecurity was associated with impaired well-being among permanent full-time workers, while no relationship was found for on-call or core part-time employees. Despite the absence of interactions between employment contract and job demands or job control, it can be concluded that knowledge about the relationship between alternative employment arrangements and the well-being of workers can be enhanced when the combined effects of employment contract and job conditions are studied.     

Two-Sex Branching Populations With Progenitor Couples in a Random Environment

In a two-sex branching model, progenitor couples are affected by random factors. The probability and the time to extinction are expressed and simulated.     

Social Competence in Children At Risk Due to Prenatal Cocaine Exposure: Continuity Over Time and Associations with Cognitive and Language Abilities

The continuity of social competence between 36 months and first grade was examined in a sample of children at risk due to prenatal exposure to cocaine (N = 92). Parent report data on social competence were collected at 36 months of age and both parent and teacher report data were collected when children were in first grade. Regression analyses indicated that 36-month social competence significantly predicted first-grade parent ratings of social competence, even after controlling for cognitive ability. Thirty-six month social competence also predicted first-grade teacher ratings of competence, but these relations were mediated by child gender and cognitive ability. Early social competence was also a significant predictor of first-grade language ability, after controlling for 36-month language. These findings emphasize the importance of early social competence for later development.     

Integrated Program Development: A Model for Meeting the Complex Needs of Homeless Persons

Homelessness is caused both by structural and personal factors. Thus, comprehensive services are required to meet the complex needs of homeless persons. This article reviews case management and group work practice with homeless persons and argues that effective social work practice must incorporate both intervention methods. Integrated Program Development (IPD), a program framework for shelter services, is presented. A pilot project at the Salvation Army Family Haven in St. Louis, Missouri illustrates the costs and benefits of empowerment-oriented group work with homeless persons. Three approaches for establishing group work for homeless people are suggested. Each approach requires that group workers, with community organizing skills, be employed by social service administrators.     

Resistance,Space and Political Identities: The Making of Counter-Global Networks

Activists in seven US cities were interviewed about why they thought people in their communities mobilized against alcohol-related problems. The data were analyzed in light of the focus on resource mobilization theory in the social movement literature. In contrast with claims that resources are the primary catalyst for change, informants emphasized the role of grievances, and to a lesser extent, bridging factors that caused residents to be more aware of or frustrated by problems, and thus ready for change. Resources seemed to provide necessary but insufficient conditions for explaining movement participation, suggesting that, to be effective, resources must be channeled to address and be linked to the grievous social conditions of inner city communities.     

国共内战时期（1946—1949年）流亡学生问题略论

1946年6月国共内战全面爆发后,国统区大中学生再次逃亡至北平、南京等大城市,形成了著名的东北流亡学生、豫鲁流亡学生群体。考察流亡学生产生的大致脉络、国民政府对流亡学生的安置措施及其成效等问题,一定程度上有助于我们从侧面了解战后国民政府试图争取人心归附的动机,展现流亡学生因＂政治＂纷争导致四处逃亡的命运。     

Graphical modelling and the Mahalanobis distance

I consider the problem of estimating the Mahalanobis distance between multivariate normal populations when the population covariance matrix satisfies a graphical model. In addition to providing a clear understanding of the dependencies in a multivariate data set, the use of graphical models can reduce the variability of the estimated distances and improve inferences. I derive the asymptotic distribution of the estimated Mahalanobis distance under a general covariance model, which includes graphical models as a special case. Two examples are discussed.