Monitoring international migration flows in Europe. Towards a statistical data base combining data from different sources

The paper reviews techniques developed in demography, geography and statistics that are useful for bridging the gap between available data on international migration flows and the information required for policy making and research. The basic idea of the paper is as follows: to establish a coherent and consistent data base that contains sufficiently detailed, up-to-date and accurate information, data from several sources should be combined. That raises issues of definition and measurement, and of how to combine data from different origins properly. The issues may be tackled more easily if the statistics that are being compiled are viewed as different outcomes or manifestations of underlying stochastic processes governing migration. The link between the processes and their outcomes is described by models, the parameters of which must be estimated from the available data. That may be done within the context of socio-demographic accounting. The paper discusses the experience of the U.S. Bureau of the Census in combining migration data from several sources. It also summarizes the many efforts in Europe to establish a coherent and consistent data base on international migration. The paper was written at IIASA. It is part of the Migration Estimation Study, which is a collaborative IIASA-University of Groningen project, funded by the Netherlands Organization for Scientific Research (NWO). The project aims at developing techniques to obtain improved estimates of international migration flows by country of origin and country of destination

The potential impact of improvements in contraception on fertility and abortion in western countries

Survey information on fertility intentions, patterns of contraceptive use, contraceptive failures and abortions is used to develop estimates of unwanted births and of unplanned pregnancies for seven countries, by method of contraception. Potential improvements in contraception, leading to more use of highly efficient methods are considered, and several scenarios for improved contraceptive use are presented. The impact each would have on fertility levels and on abortion rates is estimated. Although improvements in contraception will have only a limited impact on fertility — which is already very low — their impact on abortion could be considerable Les auteurs utilisent des données d'enquêtes sur les intentions de procréation, le recours à la contraception, les échecs de la contraception et l'avortement pour évaluer les naissances non désirées et les grossesses non planifiées, selon la méthode de contraception utilisée, dans sept pays. Ils envisagent d'éventuels progrès de la contraception conduisant à un élargissement de l'emploi de méthodes très efficaces, et évaluent, dans différents scénarios de progrès du recours à la contraception, son impact sur les niveaux de la fécondité et de l'avortement. Si le progrès de la contraception n'aura qu'un effet limité sur la fécondité — déjà très basse — son impact sur les niveaux de l'avortement pourrait être considérable.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/42729/1/10680_2005_Article_BF01797090.pd