Sampling systems indexed by the crossover point

This paper presents the designing methodology for the quick switching system, indexed by an entry parameter called the 'crossover point' (COP). The significance of the COP and the properties of the operating characteristic curve with respect to the COP are studied and the necesssary tables constructed.     

Financing of college education by single-parent and two-parent families

The financing of college education by male and female single-parent families and two-parent families is compared. Female single parents are at a significant disadvantage in being able to accumulate funds, but this is partially offset by financial aid. Variables accounting for significant variation in the parents' contribution to student education expenses are: public versus private school, financial aid, parents' saving behavior, students' contribution, race, and family type. The amount of parental contribution is positively correlated with parent net worth, family per capita income, and total student cost; it is negatively correlated with age of the student.This study utilized data from the National Postsecondary Education Student Aid Study prepared for the National Center for Education Statistics, U. S. Department of Education, by Westat, Inc. Partial support for the research was supplied by the College of Human Ecology and the Computer Science Center of the University of Maryland. The author expresses her appreciation to the Editor and Reviewers for their valuable suggestions.Her research interests include personal finance, family resource management, and personal factors affecting the handling of money. She is a graduate of Berea College, Berea, KY, and received both the M. Ed. and Ed. D. from The Pennsylvania State University.     

Resources, Living Arrangements and First Union Formation in the United States, the Netherlands and West Germany

This paper addresses the impact of the previous living arrangement (living in the parental home versus living away) on first union formation. We investigate differences between the living arrangements in the impact of individual and parental resources. Analyses are performed for three countries with different welfare regimes: the USA, the Netherlands and West Germany. Many of our findings are in line with the general hypothesis that resources matter less to union formation for those living away from the parents than for those still living in the parental home. Furthermore, the results suggest that resources matter less in Conservative Continental European welfare regimes than in the USA, a Liberal Market welfare regime. Mulder, C.H., Clark, W.A.V. and Wagner, M. 2005. Resources, Living Arrangements and First Union Formation in the United States, the Netherlands and West Germany. European Journal of Population, Mulder, C.H., Clark, W.A.V. et Wagner, M. 2005. Ressources, mode de logement et première entrée en union aux états-Unis, aux Pays-Bas et en Allemagne de l’ouest. Revue européenne de démographie.     

An autoregressive process with geometric α-laplace marginals

Geometric Laplace and geometric α-Laplace distributions are studied and certain limit properties are derived. An autoregressive process with geometric Laplace stationary marginal distribution is introduced and its properties are studied. These results are generalized to geometric α-Laplace case also and applications are discussed.     

Becoming married, depression, and alcohol problems among young adults

This paper examines three questions regarding the relationship between marriage and mental health, specifically depression and alcohol problems. First, does marriage lead to improved mental health compared to never marrying? Second, do any mental health benefits of marriage primarily accrue to men? Third, what qualitative aspects of marriage are related to psychological disorder? We explore these questions in a longitudinal sample of young adults sampled at age 21 and again at age 24. We find no indication that marriage reduces depression. Married people do report fewer alcohol problems than the never-married but this could be due to the selection of less problematic drinkers into marriage. We also fail to find that men receive disproportionate mental health benefits from marriage. Finally, we find that marital conflict is associated with problem drinking for men and depression for women. The results indicate the importance of considering stage in the life cycle and gender-sensitive indicators of psychological disorder in studies of marriage and mental health.     

Age-specific survivorship analysis ofHeliothis spp. Populations on cotton

Summary Population dynamics ofHeliothis virescens (F.) andHeliothis zea (Boddie) (Lepidoptera: Noctuidae) eggs and larvae were studied for two years in a small plot of cotton,Gossypium hirsutum (L.). Due to morphological and ecological similarities, the pooledHeliothis population was considered for most of the analyses. Two generations ofHeliothis eggs and larvae were completed during each year. Stage recruitment was estimated for the eggs and larval instars 2–6, and recruitment variances were estimated by a Monte Carlo method. A modified form of the Weibull distribution was developed and used as a model to characterize survivorship curves for each of the fourHeliothis generations. A Type I survivorship curve (mortality rate increasing with age) was inferred for both Generation 1 (early season) data sets, whereas a Type II survivorship curve (mortality rate constant and thus independent of age) was inferred for both Generation 2 (late season) data sets. The shapes of the survivorship curves for the individualH. virescens andH. zea populations were inferred to be the same as those for the pooled populations. Analysis of the contributions of various factors toHeliothis stage-specific mortality indicated that natural enemies (predators and parasites) and the availability of food for larvae were responsible for between-generation differences in survivorship patterns.