论驯鹿鄂温克人的兽皮文化

生活在大兴安岭中的驯鹿鄂温克人是鄂温克族中的独特群体,千百年来一直以饲养驯鹿和森林游猎为生。他们在特定的自然环境、特殊的生存条件以及特有的生产生活中,创造出了适合于他们物质文明和精神文明的兽皮文化。     

Geographic distribution of undocumented immigrants: estimates of undocumented aliens counted in the 1980 census by state

"This article presents estimates of the number of undocumented aliens counted in the 1980 [U.S.] census for each state and the District of Columbia. The estimates, which indicate that 2.06 million undocumented aliens were counted in the 1980 census, are not based on individual records, but are aggregate estimates derived by a residual technique. The census count of aliens (modified somewhat to account for deficiencies in the data) is compared with estimates of the legally resident alien population based on data collected by the Immigration and Naturalization Service in January 1980." Estimates are provided "for each of the states for selected countries of birth and for age, sex, and period of entry categories.... The origins of the undocumented alien population [are described], as well as some of their demographic characteristics. Some of the implications of the numbers and distribution of undocumented aliens are also discussed." This paper was originally presented at the 1984 Annual Meeting of the Population Association of America (see Population Index, Vol. 50, No. 3, Fall 1984, p. 435).     

A Comparison of Correlation Structure Selection Penalties for Generalized Estimating Equations

Correlated data are commonly analyzed using models constructed using population-averaged generalized estimating equations (GEEs). The specification of a population-averaged GEE model includes selection of a structure describing the correlation of repeated measures. Accurate specification of this structure can improve efficiency, whereas the finite-sample estimation of nuisance correlation parameters can inflate the variances of regression parameter estimates. Therefore, correlation structure selection criteria should penalize, or account for, correlation parameter estimation. In this article, we compare recently proposed penalties in terms of their impacts on correlation structure selection and regression parameter estimation, and give practical considerations for data analysts. Supplementary materials for this article are available online.     

Chastity value as a risk factor for prostituted adolescents in Indonesia: a qualitative exploration

ABSTRACT

Previous studies suggest that the practice of female child and adolescent prostitution can be attributed to various personal and social risk factors. However, cultural beliefs shared in specific societies may also determine prostitution involvement. We qualitatively explored the risk factors associated with prostitution in a rarely investigated Indonesian society. We interviewed eight female participants who were involved in adolescent prostitution. The findings suggest that prostitution involvement is not only attributed to the common personal and social risk factors, but also to cultural beliefs of chastity preservation. We argue that such beliefs may be rooted in gender inequality.     

A consideration of the effect of immigration reform on the number of undocumented residents in the United States

The volume of immigration to the United States exceeds the amount of immigration to any other nation, but quantification must rely on measurement of population stocks. Comparison of foreign-born population figures for two or more survey dates reveal net immigration but fail to partition the foreign-born population by legal status. This analysis presents national survey data on the foreign-born population in November 1989 for comparison with an independently derived estimate of the legally resident foreign-born population at the same date. The demonstration of a measurable undocumented population residing in the United States is very helpful in evaluating the success of the Immigration Reform and Control Act of 1986. Despite the legalization of 1.7 million aliens who provided evidence of undocumented residence since before 1982, and economic sanctions against employers found to hire undocumented workers, an undocumented population persists in the United States that appears to be largely composed of aliens from Latin American countries. Precise measurement of the size of this population is complicated by the uncertainties surrounding the population of approximately one million Special Agricultural Workers admitted under IRCA. The work and residence history of these aliens as well as their future labor sector experiences and residence patterns are not known. Despite efforts to stop undocumented immigration to the United States, undocumented migration, especially across the southern border, appears to have occurred at consistent levels throughout the past fifteen years.This paper reports the general results of research undertaken by Census Bureau staff. The views expressed are attributable to the author and do not necessarily reflect those of the Census Bureau.     

Marriage and divorce in twentieth century American cohorts

Marital status life tables have provided a basis for describing the marriage, divorce, and mortality experience of U.S. cohorts born 1888-1950. In brief, marriage occurred earlier and became more universal from the earliest cohorts to those of the late 1930s. More recent cohorts show declines in the proportion ever marrying and increases in the mean age at marriage. Period data for 1980 and cumulative cohort data by age suggest the likelihood of a continuing retreat from first marriage. Divorce has been rising steadily, with the latest cohorts indicating that 46 percent of male marriages and 42 percent of female marriages will end in divorce. Period data for males in 1980 raise the possibility that levels of divorce may have reached a peak, but cumulative cohort data by age show no such pattern. The present results are consistent with the view that a fundamental change in the traditional concept of marriage is underway. Traditional marriage involved the husband providing the wife with economic support and protection in return for her companionship and maternal services. Strong social pressures urged men and women to marry, and made the coveted services married persons provided each other difficult to obtain elsewhere. Recent economic changes have undermined the social and economic forces that maintained the institution of marriage. The U.S. economy has grown to include a large service sector in its labor force, and that growth has produced a dramatic increase in female labor force opportunities (Oppenheimer, 1970). The resultant large scale participation of women in economic activity blurs the traditional division of labor by sex, and goes to the very heart of the traditional marriage "bargain." At the same time, economic changes have weakened family ties by encouraging lower fertility, stressing achieved as opposed to ascribed characteristics, and fostering geographical mobility (Goode, 1970). The "marital union" of the past may be giving way to the "marital partnership" of the future, which will accommodate informal as well as formal marriages, less dependence between spouses, greater egalitarianism, lower fertility, and higher levels of divorce.     

Free Agency, Competitive Balance, and Diminishing Returns to Pennant Contention

This article argues that the 1976 introduction of free agency increased competitive balance in Major League Baseball. The evidence is based on a new empirical measure that captures the key dynamic element of balance: year-to-year fluctuations in team performance. My hypothesis is that diminishing returns to each additional year's "production" of a pennant-contending team reduces the incentive to bid continually for top players. Free agency allows talent to be reallocated more readily to potential new contenders, given that player sales had been restricted prior to 1976. The hypothesis is supported by evidence of declining attendance during contending "streaks."