Article history: Received 3 August 2013 Received in revised form 15 May 2015 Accepted 22 June 2015 Available online 2 July 2015 Attribute reduction is an important preprocessing step in datamining and knowledge discovery. The effective computation of an attribute reduct has a direct bearing on the efficiency of knowledge acquisition and various related tasks. In real-world applications, some at...

We appreciate Harper’s comments on the role of population change in explaining rising geographical inequalities in health in New Zealand. 1 As we note in our original paper, we agree that selective migration patterns may well be an important explanation as to why regional health status in New Zealand has become more geographically polarized during the 1980s and 1990s. 2 Selective patterns of mi...

Brain drain or human capital flight is a large emigration of individuals with technical skills or knowledge, normally due to conflict, lack of opportunity, political instability, or health risks. A brain drain is usually regarded as an economic cost, since emigrants usually take with them the fraction of value of their training sponsored by the government. It is a parallel of capital flight whi...

It is commonly assumed that international migration has accelerated of the past half century, and that migrants travel over increasingly large distances, and that migration has therefore become much more diverse in terms of origins and destinations of migrants (Arango 2000: 291). A related argument is that more and more countries are now experiencing significant volumes of immigration and emigr...

Due to differences in definitions and measurement methods, cross-country comparisons of international migration patterns are difficult and confusing. Emigration numbers reported by sending countries tend to differ from the corresponding immigration numbers reported by receiving countries. In this paper, a methodology is presented to achieve harmonised estimates of migration flows benchmarked to...

The decades between 1948 and 1980 are often remembered as a time of mass immigration, yet almost 2 million more people left Britain than arrived in those years. Mass emigration has been an enduring part Britain's modern history this article explores its effects on British politics. two world wars, the turn to tariffs, joining EEC leaving EU: at these critical junctures, overseas diaspora was mo...

Ireland began actively recruiting nurses internationally in 2000. Between 2000 and 2010, 35% of new recruits into the health system were non-EU migrant nurses. Ireland is more heavily reliant upon international nurse recruitment than the UK, New Zealand or Australia. This paper draws on in-depth interviews (N=21) conducted in 2007 with non-EU migrant nurses working in Ireland, a quantitative su...

High Skilled Immigration in the International Arena This conceptual paper, prepared for a United Nations Expert Group Meeting on Migration and Development, is concerned with the international mobility of high-skilled workers, previously referred to as the “brain drain”. After discussing the historical background of high-skilled international migration, the paper examines the reasons for the rec...

Metacommunity theory poses that the occurrence and abundance of species is a product of local factors, including disturbance, and regional factors, like dispersal among patches. While metacommunity ideas have been broadly tested there is relatively little work on metacommunities subject to disturbance. We focused on how localized disturbance and dispersal interact to determine species compositi...

Using panel data on 12 European source countries that are followed for 26 years (1873-1898), this paper studies agespecific emigration rates and the age composition of U.S. immigration. Two age groups are the focus of attention, 15-40 and over 40. Emigration-rate models and compositional models that satisfy adding-up conditions are estimated by the Hausman-Taylor Instrumental Variable approach....