An improved class of estimators for the population mean

Starting from the Rao (Commun Stat Theory Methods 20:3325–3340, 1991) regression estimator, we propose a class of estimators for the unknown mean of a survey variable when auxiliary information is available. The bias and the mean square error of the estimators belonging to the class are obtained and the expressions for the optimum parameters minimizing the asymptotic mean square error are given in closed form. A simple condition allowing us to improve the classical regression estimator is worked out. Finally, in order to compare the performance of some estimators with the regression one, a simulation study is carried out when some population parameters are supposed to be unknown.     

Exchange Rate Policy in Serbia

In August 2006, Serbia adopted an inflation targeting regime as its monetary regime. The initial period of implementation of this regime was characterized by an extremely high capital inflow and appreciation of the exchange rate of the dinar. Under such conditions, the selected monetary policy regime functioned well. However, at the end of 2008, when the global financial crisis caused the outflow of foreign capital, deterioration of foreign borrowing conditions and an increase in inflationary expectations, the dinar lost about 25 per cent of its value within a relatively short period, despite the interventions of the National Bank of Serbia in the foreign exchange market. Therefore, the authors of this paper raise a dilemma whether Serbia conducts an adequate policy of the exchange rate of the dinar. The authors point out that, at the moment, the policy of a free floating exchange rate is not adequate for Serbia. As an alternative, a two nominal-anchor regime—inflation and the exchange rate—is proposed.     

Testing the Comparability of Different Types of Social Indicators Across Groups

The social indicator movement has realized a considerable increase in importance during the last 50 years. This happened not the least by the publications in the journal Social Indicators Research. Social indicators have been developed for many aspects of life. The scores on these indicators often are compared through time and across groups. An essential requirement for such research is that the measures used are comparable through time and across groups. The comparability through time is not such a big problem but the comparability of measures across groups is not so obvious. This requires harmonization of indicators based on objective variables and invariance testing for indicators based on subjective and objective variables. In this paper we discuss how the comparability of different types of social indicators based on subjective and objective variables can be tested using invariance testing. This is a relevant issue because the existing testing procedure is designed for only one type of social indicators and this test is not directly applicable on the other types of social indicators.     

Broadcasting multiple messages in the 1-in port model in optimal time

In the 1-in port model, every vertex of a synchronous network can receive at most one message in each time unit. We consider simultaneous broadcasting of multiple messages from the same source or from distinct sources in such networks with an additional restriction that every received message can be sent out to neighbors only in the next time unit and never to already informed vertex. We use a general concept of level-disjoint partitions developed for this scenario. Here we introduce a subgraph extension technique for efficient spreading information within this concept. Surprisingly, this approach with so called biwheels leads to simultaneous broadcasting of optimal number of messages on a wide class of graphs in optimal time. In particular, we provide tight results for bipartite tori, meshes, hypercubes, Knödel graphs, circulant graphs. We also propose several open problems and conjectures.     

Measurement Invariance in Multilingual Survey Research: The Role of the Language of the Questionnaire

This paper examines whether or not survey measures asked to two linguistic groups exhibit invariance within a country. It tests configural, metric and scalar invariance in a model that distinguishes the response component and the cognitive component of the measurement process using survey items. Our findings show that when differences in the response process are allowed, concepts are (partially) invariant across groups. The analysis is conducted for items measuring some aspects of political trust and satisfaction with politics for six linguistic groups including French, Dutch, Estonian, German, Ukrainian and Russian in four countries. Data comes from the European Social Survey.     

‘Widening cross-disciplinary research for mental health’: what is missing from the Research Councils UK mental health agenda?

This current issues article is a brief critical examination of the recent Research Councils UK agenda and call for cross-disciplinary research in mental health. Our argument is based on the fact that patient and public involvement (PPI) is the only involvement and influencing strategy for service users and survivors in the agenda. Service user and survivor research as a discipline in itself remains unacknowledged. We conclude that service user and survivor research is distinct and is different to PPI, and should be recognised in any mental health research agenda.     

Maternal struggles and the politics of childlessness under pronatalist Caribbean slavery

ABSTRACT

This article considers the relationship of enslaved and apprenticed women in the Anglophone Caribbean to the embodied experience of childbearing, motherhood, and childlessness. It places this analysis in the context of a discussion of the development and implementation of pronatalist policies in the Anglophone Caribbean during the late period of slavery. It examines the experience of pronatalist policies by enslaved women, using as a case study a microhistory from Jamaica during the apprenticeship period (1834–1848). Although the existence of pronatalist policies gave some women (mothers with large numbers of children) a position from which to claim reduced workloads and other ‘rights’, they made the situation of childless women more difficult. In historians' attention to the struggles of mothers, we have sometimes paid insufficient attention to the perspective of childless and bereaved women.     

Sozialer Status und prosoziales Handeln: Ein Quasi-Experiment im Krankenhaus

Sociological, social psychological and economic research on the nexus between socioeconomic status and prosociality has so far provided contradictory findings. Some studies suggest that actors with a high socioeconomic status act more egoistically than actors with a lower socioeconomic status. Other studies find the opposite to be true. In contrast to previous research, which has worked with one-dimensional measures for socioeconomic status, this study examines prosocial behavior among occupational groups that have regular real-life contact in their workspace. About 150 hospital employees (physicians, nursing staff and nursing students) participated in experiments on altruistic giving in dictator games. The findings are surprisingly strong and clear-cut: Actors with higher social status act more prosocial than low-status actors. Furthermore, we find hardly any in-group effects, which have been repeatedly postulated. Our findings support the claim that high status promotes prosocial behavior. Also, they indicate that the inconclusive and in part contradictory findings provided by previous research stem to a considerable degree from deficient measures of social status and problematic experimental designs.     

Silent privatisation of customary land in Zambia: opportunities for a few,challenges for many

The conversion of customary land into leasehold tenure has sparked intense debates in Zambia and beyond. Growing interest in land in the last decade and half has led to a spike in demand for land across Africa, especially land adjacent to major cities, towns and developed infrastructure. This growing demand for land is gradually being directed at customary land, which well-resourced urban and local elites, as well as foreign investors, are converting from customary to private tenure, raising serious questions about the future of customary land in Africa. This paper discusses the emerging dynamics around customary land conversion drawing from a case study conducted in Chongwe and Chibombo districts in Zambia. Evidence gathered in this study suggest that while the conversion of customary land to leasehold tenure is generating opportunities for the urban elite, a few traditional leaders and international investors, it is, at the same time, creating serious challenges for the majority of the people in the local communities.