New realities of the American family

The demographic, social, and economic characteristics of American families have changed dramatically over the past few decades. While the male breadwinner/female homemaker model was long traditionally typical,l contemporary families may be openly made up of single-parents, remarried couples, unmarried couples, stepfamilies, foster families, extended or multigenerational families, or 2 families within 1 household. Families are now most likely to have 3 or fewer children, a mother employed outside of the home, and a 50% chance of parental divorce before the children are grown. These trends are common not only in America, but in most industrialized nations around the world. In fact, family trends are so fluid that the US Census Bureau and workplace policy find it difficult to keep pace. This report presents and discusses social and demographic trends behind the ever-changing face of the American family. Households and types of families are further defined, as are the living arrangements of children, young adults, and the elderly. Marriage, divorce, and remarriage trends, age at marriage rates, and interracial marriage are then discussed. Next examined are declining family size, teenage parents, contraception and abortion, unwed mothers, and technological routes to parenthood. The changing roles of family members and family economic well-being are discussed in sections preceding closing comments on the outlook for the American family.     

Trends in refugee policy and cooperation in the European Community

The author outlines policies of the European Community concerning migration and political asylum. Special consideration is given to the definition of refugees within such policies.     

The evolution of French immigration policy after May 1981

Changes and continuities in French immigration policies, following the assumption of power by the socialist government in 1981, are described. Attention is focused on the political implications of immigration and on the role of immigrants in French politics. Efforts to restrict immigration to France were initiated in 1931, but clandestine immigration, especially from Portugal, remained largely unchecked for 4 decades. In the early 1970s, stricter enforcement measures were adopted, but these measures met with considerable international and national opposition. In 1977, the government altered its approach to immigration by offering financial aid to help illegal migrants return to their countries of origin. These efforts met with little success, and in 1980 the government initiated measures to promote the integration of immigrants into French society. The socialistic government basically adhered to the immigration policies of the preceding government. The current government seeks: 1) to stop further illegal immigration through the intensification of border controls, 2) to grant amnesty to illegal aliens who currently reside in the country and who meet certain employment requirements, 3) to penalize employers who hire illegal aliens or who contract to bring illegal aliens into the country, and 4) to improve living conditions for legal immigrants. The politicalization of immigration has increased in recent years. Current issues center on the human and political rights of migrants and on arbitary administrative efforts to control immigration. It was expected that migrants would acquire political rights after the 1981 election; however, this expectation was not realized, and the political status of immigrants remains an unsettled issue. Consequently migrants have become pawns in the political struggle between different groups in the population both at the national and the local level. Immigration threatens to become an explosive issue. At the same time, migrants themselves are playing an increasingly prominent role in political activities, such as rent strikes and protest movements.     

The behavioral function: An inquiry into the relation between behavior and utility

The idea that an individual's behavior is a function of its utility or Value represents a very common and fundamental assumption in the study of human conduct. In this paper it will be attempted to determine the nature of this function more precisely. Adopting a probabilistic conception of human action, it appears that an exponential function perfectly satisfies the empirical as well as formal conditions which it seems necessary to impose upon it initially. Empirical research into behavioral change lends additional support to the function thus constructed.     

Linear censored quantile regression: A novel minimum-distance approach

In this article, we investigate a new procedure for the estimation of a linear quantile regression with possibly right-censored responses. Contrary to the main literature on the subject, we propose in this context to circumvent the formulation of conditional quantiles through the so-called “check” loss function that stems from the influential work of Koenker and Bassett (1978). Instead, our suggestion is here to estimate the quantile coefficients by minimizing an alternative measure of distance. In fact, our approach could be qualified as a generalization in a parametric regression framework of the technique consisting in inverting the conditional distribution of the response given the covariates. This is motivated by the knowledge that the main literature for censored data already relies on some nonparametric conditional distribution estimation as well. The ideas of effective dimension reduction are then exploited in order to accommodate for higher dimensional settings as well in this context. Extensive numerical results then suggest that such an approach provides a strongly competitive procedure to the classical approaches based on the check function, in fact both for complete and censored observations. From a theoretical prospect, both consistency and asymptotic normality of the proposed estimator for linear regression are obtained under classical regularity conditions. As a by-product, several asymptotic results on some “double-kernel” version of the conditional Kaplan–Meier distribution estimator based on effective dimension reduction, and its corresponding density estimator, are also obtained and may be of interest on their own. A brief application of our procedure to quasar data then serves to further highlight the relevance of the latter for quantile regression estimation with censored data.     

温度、时间和水分对配合饲料脂质酸败的影响

采用三因素二次回归正交组合设计 ,研究了温度 (6～ 4 2℃ )、时间 (3～ 57d)和水分 (9%～ 1 8% )与配合饲料 (1 0～ 2 0kg仔猪 )脂质酸败的关系。试验结果表明 :脂质水解酸败随着温度升高、时间延长和水分含量升高 ,呈极显著线性增强 (P <0 .0 1 )。水分范围 1 6%～ 1 8%配合饲料脂质氧化酸败最慢 ,随着饲料水分含量的降低 (低于 1 6% ) ,温度的升高 (6～ 4 2℃ )和时间的延长 (3～ 57d) ,脂质氧化酸败显著地增强 (P <0 .0 5)。水分含量 1 6% ,贮藏温度低于 2 0 .6℃ ,贮藏时间在 2 4 .0d内 ,饲料未产生酸败味     

The Influence of Advance Letters on Response in Telephone Surveys: A Meta-Analysis

Recently, the leading position of telephone surveys as the majormode of data collection has been challenged. Telephone surveyssuffer from a growing nonresponse, partly due to the generalnonresponse trend for all surveys and partly due to changesin society and technology influencing contactability and willingnessto answer. One way to counteract the increasing nonresponseis the use of an advance letter. In mail and face-to-face surveys,advance letters have been proven effective. Based on the proveneffectiveness in face-to-face and mail surveys, survey handbooksadvise the use of advance letters in telephone surveys. Thisstudy reviews the evidence for this advice and presents a quantitativesummary of empirical studies on the effectiveness of advanceletters in raising the response rate for telephone surveys.The major conclusion is that advance letters are also an effectivetool in telephone surveys, with an average increase in responserate (RR1) from 58 percent (no letter) to 66 percent (advanceletter), and an average increase in cooperation rate (COOP1)from 64 percent (no letter) to 75 percent (advance letter).     

Understanding sources and types of social capital in Peru

Social capital is broadly defined as the ‘value’of social relationships. A substantial amount of work has beenconducted into the role of social capital, but little of ithas focused on Latin America and Peru in particular. Standardtools are often used to measure social capital in differentcultural settings. We argue that while there are common themes,the exact nature of social capital is dependent upon the specificnorms of behaviour, networks and organizations that characterizea given setting. Social capital is a multidimensional and culturallyspecific concept. The contribution that different organizationsand networks make to different aspects of social capital variesby setting (rural/urban), person involved (male/female), andover time, highlighting the need for culturally sensitive measures.Two approaches are used to describe the characteristics of socialcapital in Peru: a literature review of research on social capitalin Peru, and qualitative in-depth interviews with twenty respondentsfrom one rural and two urban areas of Peru.