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581.
Chris Wilson Tomáš Sobotka Lee Williamson Paul Boyle 《Population and development review》2013,39(1):131-157
There are long‐standing concerns over low fertility levels in Europe and an increasingly important debate on the extent to which migration can compensate for below‐replacement fertility. To inform this debate, a wide array of indicators have been developed to assess the joint influence of fertility, mortality, and migration on birth replacement and intergenerational replacement. These indicators are based on various models and assumptions and some are particularly data demanding. In this article we propose a simple method to assess how far migration alters the extent of replacement for a birth cohort as it ages. We term the measure the overall replacement ratio (ORR). It is calculated by taking the size of a female birth cohort at selected ages divided by the average size of the cohorts of mothers in the year of birth. We present estimates of the ORR for a range of European countries representing different replacement regimes. We demonstrate that for many countries net migration has become a key factor in their population trends during the last few decades. 相似文献
582.
The development of a composite indicator (CI) over a set of individual indicators is worthwhile in case the methodological aggregation process is sound and the results are clear. It can then be used as a powerful tool for performance evaluation, benchmarking, and decision making. In this respect, data envelopment analysis (DEA), as a self appraisal technique, has recently received considerable attention in the construction of CIs for policy analysis and public communication. However, due to the ever increasing complexity of numerous performance evaluation problems, more and more potential indicators might be developed to represent an evaluation activity in a more comprehensive way. These indicators might also belong to different categories and further be linked to one another constituting a multilayer hierarchical structure. Simply treating all the indicators to be in the same layer as is the case in the basic DEA model thereby ignores the information on their hierarchical structure, and further leads up to weak discriminating power and unrealistic weight allocations. To overcome this limitation, a multiple layer DEA-based CI model is developed in this study to embody a hierarchical structure of indicators in the DEA framework, and both its primal and dual form are realized. The proposed model is illustrated by constructing a composite road safety performance index for a set of European countries. 相似文献
583.
584.
Scientific ideas neither arise nor develop in a vacuum. They are always nutured against a background of prior, partially conflicting
ideas. Systemic hypothesistesting is the problem of testing scientific hypotheses relative to various systems of background
knowledge. This paper shows how the problem of systemic hypothesis-testing (Sys HT) can be systematically expressed as a constrained
maximimization problem. It is also shown how the error of the third kind (E
III) is fundamental to the theory of Sys HT.The error of the third kind is defined as the probability of having solved the ‘wrong’ problem when one should have solved
the ‘right’ problem. This paper shows howE
III can be given both a systematic as well as a systemic treatment. Sys HT gives rise to a whole host of new decision problems,
puzzles, and paradoxes. 相似文献
585.
We propose a non-parametric methodology to study the presence of economies of scope between teaching and research (i.e., the teaching–research nexus). In particular, the paper advocates a conditional version of the ‘benefit-of-the-doubt’ approach to estimate the relationship between professors’ overall academic output, measured by a composite measure of multi-dimensional and importance-adjusted scores of teaching effectiveness and research productivity, and the time devoted to teaching and to research. The methodology is illustrated with a dataset of professors working at a Business & Administration department of a university college where the time allocation of teaching and research was assigned exogenously. The outcome of the analysis indicates the presence of limited scope economies for professors with an extensive research time. 相似文献
586.
Tom?KleinepierEmail author Helga?A.?G.?de?Valk Ruben?van?Gaalen 《Revue europeenne de demographie》2015,31(2):155-179
After Poland’s accession to the European Union in 2004, Polish migration within Europe has increased considerably. Still, little is known about this large and growing group of immigrants. Using unique panel data from the Dutch population registers, we first apply sequence analysis to explore and describe the variety of family life courses among young adult (aged 20–30 at migration) Polish migrants in the Netherlands. Each individual family life career is followed for a 5-year period on a monthly time base. Optimal matching analysis is applied to compute (dis)similarities between individuals, in order to cluster into predominant life paths. Second, a series of logistic regression analyses were carried out to determine the main factors of importance on the different family life paths. Findings showed a strong impact of the partner’s origin on the type of union and likelihood of return migration. Unemployment was found to be another important trigger of return migration. With regard to gender differences, we found that men are more likely to remain single and to leave the Netherlands at some point, while women more often cohabit and tend to stay. 相似文献
587.
In late 10th century England, a little-known and long-dead bishop named Swithun was canonised and became one of the most-widely culted saints in the country. Behind the creation of the cult of Saint Swithun were communication and political strategies with aspects of brand creation and extension, fund-raising, message creation and delivery, and stakeholder engagement using tactics such as word-of-mouth, the creation of special events and music, and use of specially commissioned publications. Using the prism of modern public relations practice and theory, the creation and maintenance of this important saintly cult is reviewed. 相似文献
588.
589.
We study adaptive importance sampling (AIS) as an online learning problem and argue for the importance of the trade-off between exploration and exploitation in this adaptation. Borrowing ideas from the online learning literature, we propose Daisee, a partition-based AIS algorithm. We further introduce a notion of regret for AIS and show that Daisee has cumulative pseudo-regret, where is the number of iterations. We then extend Daisee to adaptively learn a hierarchical partitioning of the sample space for more efficient sampling and confirm the performance of both algorithms empirically. 相似文献
590.
ABSTRACT: It is noticed that in both theoretical and empirical analyses concerning the relationship between corporatism and economic performance, the role of government is kept rather implicit. This article aims to incorporate government into the analysis in a more explicit way by analyzing whether government policies differ between corporatist and non-corporatist countries. The empirical results of the research reveal that corporatist countries are not only characterized by centralization or coordination of wage bargaining, but also by relatively high government expenditure, tax revenues, a higher ratio of active to passive labour market policies and also higher average unemployment benefits. 相似文献