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71.
Montgomery MR Richards T Braun HI 《Journal of the American Statistical Association》1986,81(394):297-309
This study examines the possibility that estimation of the effect of breast-feeding on infant survival is affected by selection bias, in that children who are healthier at birth may be more likely to be breast-fed. Data are from the 1976 Malaysian Family Life Survey. "Ordinary logit models for breast-feeding and survival are estimated, and the results suggest that selection is indeed present. For example, children of higher birth weight appear to be more likely to be breast-fed and likely to survive. In addition, weight at birth and the duration of breast-feeding appear to be linked." Using birth weight as an indicator for the child's health, the authors conclude that "the direct influence of breast-feeding on survival remains of overwhelming importance even after corrections for selection bias are made." 相似文献
72.
一、哪些做法不对?社会学确实在许多大学生的心目中威信不高,他们时常认为:社会学令人厌烦地对一些明显的、过分抽象的和对生活用处不大的事理作过分冗长的讨论,是堪与经济学并列的最"乏味"的科学.我们的一些同行认为,产生这种看法的原因是社会学太专业化和科学化了.但我们认为原因远不止此.专业化的知识对于任何寻求更多地了解世界的科学来说,似乎是必不可少的和正当的目标.问题不在于教师对学生教授了什么,而在于哪些还没有传授给 相似文献
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USSR. Tsentral'noe Statisticheskoe Upravlenie 《Vestnik statistiki (Moscow, Russia : 1949)》1985,(3):80
In this one-page statistical summary, data are presented for the USSR as a whole on fertility, mortality, and natural increase. The data are for five-year intervals from 1940 to 1980 and for single years from 1980 and are presented in terms of both totals and rates. 相似文献
78.
United Nations. General Assembly 《The International migration review》1985,19(3):573-615
This preamble documents the 91 Articles of the International Convention on the Protection of the Rights of All Migrants and Their Families. This defines and covers the rights of all migrant workers and their families which can be ratified by as many countries as possible. The status and fundamental rights of migrant workers and their families have not been sufficiently recognized everywhere and therefore require appropriate international protection. The 8 parts are: 1) scope and definitions, 2) fundamental human rights of all migrant workers and members of their families, 3) additional rights of migrant workers and members of their families in a regular situation, 4) provisions applicable to particular categories of migrant workers and members of their families, 5) promotion of sound, equitable and humane conditions in connection with lawful international migration of workers and their families, 6) application of the Convention, 7) general provisions, and 8) final provisions. 相似文献
79.
The impact of immigration on unemployment in Canada is examined for the period 1983-1985. The authors attempt to construct a balance sheet of immigration in terms of labor supply and demand. They conclude that immigrants create more jobs than they fill, and that their net effect on the employment situation is positive. (SUMMARY IN FRE AND SPA) 相似文献
80.
Saignes T 《Latin American population history newsletter》1987,(13):16-21
The author describes and evaluates some little-known sources of data on the Southern Andes for the period from the sixteenth to the eighteenth century. 相似文献