The changing importance of white women's economic prospects for assortative mating

Given recent changes in the labor force participation and economic standing of women, we ask whether a woman's position in the labor market has become a more important determinant of her position in the marriage market. Unlike much prior research on trends over time in assortative mating, we take an individual‐level approach to the analysis and rely on improved measures of labor market position, such as measuring wives' wages before marriage and considering multiple indicators of husbands' longer term economic standing. Our analysis relies on data from the National Longitudinal Survey of Young Women (N = 759) and the National Longitudinal Survey of Youth (N = 767). Our results are consistent with growth over time in the importance of women's earnings potential in determining their marriage prospects.     

Altruism,the free rider problem and group size

This paper is a survey of recent theoretical work on the influence of group size, perceived effectiveness or noticeability of one's behavior on a group member's altruistic responses. Experiments on this problem are analyzed and evaluated, and problems for future research are outlined.This paper is a revised version of a paper originally presented at the March 1973 meetings of the Public Choice Society. In preparing this paper I have benefited from criticisms and suggestions made by a number of people and I wish to take this opportunity to thank them. Among them are John Bonin, Barry Groffman, Bob O'Gorman, Don Moon, George Reynolds and Harrison Wagner.     

The National Digital Newspaper Program: Building on a Firm Foundation

Abstract

The development of the National Digital Newspaper Program (NDNP) is founded on the distributed cataloging and preservation microfilming work of an earlier United States Newspaper Program. This article provides a high-level review of NDNP goals, participant roles, phased development approach, and the Chronicling America Web site.     

Why adult children return home

This article examines the question of why more young adults are living with their parents. The expectation of the 1960s and 1970s that grown children establish separate residence, even before marriage, began to erode in the 1980s. We asked a small, convenience sample of parents and coresident adult children to respond to two possible interpretations of the trend: (1) that children return home due to economic hardship, or (2) that children return home because they feel entitled to a particular standard of living. Parents and children concluded that economic factors drive adult children home again, but few of the adult children in this study had come home because of genuine economic hardship.     

Addressing Nonlinearity in the Exposure-Response Relationship for a Genotoxic Carcinogen: Cancer Potency Estimates for Ethylene Oxide

Ethylene oxide (EO) has been identified as a carcinogen in laboratory animals. Although the precise mechanism of action is not known, tumors in animals exposed to EO are presumed to result from its genotoxicity. The overall weight of evidence for carcinogenicity from a large body of epidemiological data in the published literature remains limited. There is some evidence for an association between EO exposure and lympho/hematopoietic cancer mortality. Of these cancers, the evidence provided by two large cohorts with the longest follow-up is most consistent for leukemia. Together with what is known about human leukemia and EO at the molecular level, there is a body of evidence that supports a plausible mode of action for EO as a potential leukemogen. Based on a consideration of the mode of action, the events leading from EO exposure to the development of leukemia (and therefore risk) are expected to be proportional to the square of the dose. In support of this hypothesis, a quadratic dose-response model provided the best overall fit to the epidemiology data in the range of observation. Cancer dose-response assessments based on human and animal data are presented using three different assumptions for extrapolating to low doses: (1) risk is linearly proportionate to dose; (2) there is no appreciable risk at low doses (margin-of-exposure or reference dose approach); and (3) risk below the point of departure continues to be proportionate to the square of the dose. The weight of evidence for EO supports the use of a nonlinear assessment. Therefore, exposures to concentrations below 37 microg/m3 are not likely to pose an appreciable risk of leukemia in human populations. However, if quantitative estimates of risk at low doses are desired and the mode of action for EO is considered, these risks are best quantified using the quadratic estimates of cancer potency, which are approximately 3.2- to 32-fold lower, using alternative points of departure, than the linear estimates of cancer potency for EO. An approach is described for linking the selection of an appropriate point of departure to the confidence in the proposed mode of action. Despite high confidence in the proposed mode of action, a small linear component for the dose-response relationship at low concentrations cannot be ruled out conclusively. Accordingly, a unit risk value of 4.5 x 10(-8) (microg/m3)(-1) was derived for EO, with a range of unit risk values of 1.4 x 10(-8) to 1.4 x 10(-7) (microg/m3)(-1) reflecting the uncertainty associated with a theoretical linear term at low concentrations.     

Modeling for insights,not numbers: the experiences of the energy modeling forum

It has often been contended that the primary goal of policy modeling should be the insights quantitative models can provide, not the precise-looking projections—i.e. numbers—they can produce for any given scenario. Students of the energy policy process, in particular, have noted that preoccupation with the plethora of detailed quantitative results produced by large-scale computer models has substantially impeded their influence on key policy decisions. The creation of the Energy Modeling Forum (EMF) at Stanford University in 1976 represents one potential remedy for that situation. The EMF was formed to foster better communication between the builders and users of energy models in energy planning and policy analysis. The EMF operates through ad hoc working groups, composed of national and, more recently, international energy modeling and policy experts. These working groups conduct studies concentrating on a single energy topic. The diversity of backgrounds of the working group members ensures that the language of the EMF studies is English, not computer. Each working group identifies existing models relevant to the study's focus. A series of tests is then designed by the group to illuminate the models' basic structure and behavior. A comparison of results is published in a widely distributed report that identifies the models' strengths and weaknesses in the context of the study's topic. Seven EMF studies have been initiated to date: (1) Energy and the economy, (2) Coal in transition, (3) Electric load forecasting, (4) Aggregate elasticity of energy demand, (5) US oil and gas supply, (6) World oil and (7) Macroeconomic impacts of energy shocks. Each EMF study has broadened the understanding of the nature of the relevant policy issues and the models that have been, are, or could be used to address them. The present paper describes how each study's key insights were developed in the context of a simplified analytical framework that provided the proper perspective for understanding the model results.     

Comparing Ourselves to Others: International Knowledge and Attitudes

The authors focus on the collaboration between a university methods professor and two classroom teachers in teaching social studies methods as a way of bridging the gap between university preparation for teaching social studies and putting that preparation into practice in elementary classrooms. The teachers offer recommendations from their own teaching experiences for how preservice teachers can find time for powerful social studies teaching despite pressures to meet the requirements of No Child Left Behind in literacy and mathematics. They integrate social studies with literacy and math, use "teachable moments" and transitions between subjects, and incorporate social studies research with computer and media skills. In addition, they employ class meetings to practice the democratic processes of collectively setting and revising class rules, accepting responsibility for those rules, and working together to solve classroom problems. Informal feedback from the preservice teachers reflects their appreciation of advice from classroom teachers with current experience in addressing the challenge of making time for powerful social studies teaching.     

Practitioners' views on elder mistreatment research priorities: recommendations from a Research-to-Practice Consensus conference

This article presents recommendations from expert practitioners and researchers regarding future directions for research on elder abuse prevention. Using the Research-to-Practice Consensus Workshop model, participants critiqued academic research on the prevention of elder mistreatment and identified practice-based suggestions for a research agenda on this topic. The practitioners' critique resulted in 10 key recommendations for future research that include the following priority areas: defining elder abuse, providing researchers with access to victims and abusers, determining the best approaches in treating abusers, exploiting existing data sets, identifying risk factors, understanding the impact of cultural factors, improving program evaluation, establishing how cognitive impairment affects legal investigations, promoting studies of financial and medical forensics, and improving professional reporting and training. It is hoped that these recommendations will help guide future research in such a way as to make it more applicable to community practice.     

A METHOD FOR SOLVING LINEAR PROGRAMS WITH VARIABLE RESOURCES

This paper is concerned with the solution of linear and linear goal programming problems in which the values of the right-hand side parameters are not fixed constants. Specifically, we are concerned with linear optimization problems in which the right-hand sides of the constraining equations are free to vary subject to a set of linear constraining equations. By formulating a relaxed linear program wherein the right-hand sides are treated as variables, we show how it is possible to solve one larger linear program that yields as a solution not only the optimal values for the decision variables, but also the optimal values for the right-hand sides.     

A PLURALITY MAXIMIZING APPROACH TO THE ALLOCATION OF CAMPAIGN RESOURCES

An important problem in the planning of political campaigns is the allocation of resources to precincts and other geographical voting units in order to maximize a candidate's plurality. Essentially, parties may increase candidate plurality by engaging in registration drives, midcampaign activities such as canvassing and candidate appearances, and get-out-the-vote drives. Based on previous work which has related voter response to party identification, the authors develop a model for the optimal allocation of campaign resources to these activities. The computational feasibility of the solution procedure is made possible by a decomposition across activities.