Gender,Family Structure,and Adolescents’ Primary Confidants

Using data from the National Longitudinal Survey of Youth 1997 (N = 4,190), this study examined adolescents’ reports of primary confidants. Results showed that nearly 30% of adolescents aged 16 – 18 nominated mothers as primary confidants, 25% nominated romantic partners, and 20% nominated friends. Nominating romantic partners or friends was related to increased risk‐taking behaviors, supporting the attachment notion that shifting primary confidants to peers in adolescence may reflect premature autonomy from parents. Tendencies to prefer romantic partners over parents varied by gender and family structure, which were greater for those from single‐father families and girls from mother‐stepfather families, but less for those from single‐mother families and boys from mother‐stepfather families, compared with their counterparts from two‐biological‐parent families.     

汽车车灯零部件产品数据库管理系统

用Ａｃｃｅｓｓ９７软件研制开发了一套应用于企业产品信息管理的数据库管理系统,实现了产品信息管理的必要功能。     

A test statistic for weighted runs

A new test statistic based on runs of weighted deviations is introduced. Its use for observations sampled from independent normal distributions is worked out in detail. It supplements the classic χ² test which ignores the ordering of observations and provides additional sensitivity to local deviations from expectations. The exact distribution of the statistic in the non-parametric case is derived and an algorithm to compute p-values is presented. The computational complexity of the algorithm is derived employing a novel identity for integer partitions.     

A Research Note on the Stability of Coresidential Unions Formed Postconception

There is a large literature examining the stability of mid‐pregnancy unions, and parallel work on unions formed after a nonmarital birth, but research has yet to compare pre‐ and postbirth unions and simultaneously consider whether the union is with the father or a new partner. Using the National Longitudinal Survey of Youth, 1997 Cohort, the author compares the stability of coresidential unions (cohabitations and marriages) among three groups of mothers with nonunion first conceptions: those with a mid‐pregnancy union with the father (n = 203), those with a postbirth union with the father (n = 333), and those with a union with a new partner (n = 342). Compared to mid‐pregnancy unions with the father, postbirth father unions are 35% more likely to dissolve. New‐partner unions are more likely to dissolve than both types of father unions. These associations persist when accounting for union type and socioeconomic and demographic characteristics.     

PowerPoint97在教育教学中的应用

根据PowerPoint97支持多媒体的特点，描述了用它制作教学课件的方法和步骤，并对素材的制备予以概述。     

When the Kids Live at Home: Coresidence,Parental Assets,and Economic Insecurity

This study uses National Longitudinal Survey of Youth 1979 cohort data from 1994 through 2012 (N = 16,108 person‐years, 4,671 individuals) to investigate how coresidence with adult children influences asset levels among parents. It applies hybrid mixed effects regression models that partition between‐ and within‐person variation to estimate parental savings and financial assets over time and across different households. The results suggest that coresidence with adult children led to decreases in parental assets and savings. In the years in which their children lived at home, parents held 24% less in financial assets and 23% less in savings when compared with the years when adult children were not present. By expanding previous research that shows a relationship between increasing economic insecurity, limited wealth, and the rise in coresidence among young adults, this study also offers broader implications for the interconnectivity of financial hardship across generations.     

Bayesian analysis of an econometric model of birth inputs and outputs

This study offers a simultaneous equations model of the birth process with seven endogenous variables: four birth inputs (maternal smoking, maternal drinking, first trimester prenatal care, and maternal weight gain) and three birth outputs (gestational age, birth length, and birth weight). The data are taken from the National Longitudinal Survey of Youth. Our analysis conditions on twenty-nine exogenous variables including four racial dummies to account for the widely cited racial differences in birth outputs. We find that there is sizeable correlation between the disturbances in the four input and three output equations and among output disturbances, and that results from our simultaneous equations model are substantially different from those using the single-equation approach. It appears that the High/Low Risk Birth Weight Puzzle remains unresolved under our modeling framework.All correspondence to Kai Li. The authors gratefully acknowledge the research support of the Social Sciences and Humanities Research Council of Canada, and helpful comments on an earlier draft by the editor (Junsen Zhang), two anonymous referees, Sid Chib, Kei Hirano, John Geweke, Gary Koop, seminar participants at the University of Alberta, the University of California at Irvine, University of Kansas, University of Minnesota, Queen Mary College of University of London, Washington University at St. Louis, and participants of the 2001 Winter Meetings of the Econometric Society in New Orleans. We are solely responsible for any errors contained herein. Responsible editor: Junsen Zhang.     

Do all roads lead to Rome? Effect of educational trajectories on educational transitions

“Non-traditional” educational trajectories are increasingly common among American students. This study assesses the implications of this phenomenon for inequality in educational attainment. A proper account of educational trajectories requires simultaneous consideration of qualitatively different types of destinations within educational transitions, of the timing at which different transitions occur, and of the sequence of events within educational levels. To examine “traditional” and “non-traditional” pathways through post-secondary education, this study relies on detailed educational histories from the National Longitudinal Survey of Youth 1979–2002. Findings reveal that deviations from a traditional trajectory are widespread, are more frequent among students who enrolled in less selective colleges, and also among socioeconomically and academically disadvantaged students. Results show that following a “non-traditional” pathway reduces students’ chances to enroll in college and to complete a post-secondary degree. In the case of bachelor's degree completion, most of the observed gap among students from different socioeconomic backgrounds is accounted for the different trajectories students follow. This study demonstrates that a fine-grained analysis of students’ trajectories improves our understanding of the persistent socioeconomic disparities in educational attainment.     

Religion,Marriage Markets,and Assortative Mating in the United States

As interfaith marriage has become more common, religion is thought to be less important for sorting partners. Nevertheless, prior studies on religious assortative mating use samples of prevailing marriages, which miss how local marriage markets shape both partner selection and marriage timing. Drawing on search theory and data from 8,699 young adults (ages 18–31 years) in the National Longitudinal Study of Youth 1997, the author examined the association between the concentration of coreligionists in local marriage markets and marriage timing and partner selection using event history methods. Religious concentration is associated with higher odds of transitioning to marriage and religious homogamy (conditional on marriage) for women and men at older ages (24–31 years) but not at younger ages (18–23 years). The association was also stronger for non‐Hispanic Whites when compared with other racial and ethnic groups. The findings indicate that religion remains relevant in sorting partners for many young adults in today's marriage market.