Analysts of cross-sectional or panel surveys often base inferences about relationships between variables on complete units, excluding units that are incomplete due to item nonresponse or attrition. This practice is justifiable if exclusion is ignorable in an appropriate sense. This paper characterizes certain types of ignorable exclusion in surveys subject to item nonresponse and develops tests...

19 ABSTRACT {Continue on reverse if necessary and identify by block number) Because pregnancy accounts for a large proportion of the attrition among enlisted Marine Corps women, an investigation was conducted of the effects of traditional family/career orientation, feelings of isolation, and feelings of dissatisfaction with the Marine Corps on incidence of pregnancy and pregnancy attrition amon...

Since the 1980s the United States has faced growing disinterest and high attrition from STEM majors. Over the same period, foreign-born enrollment in U.S. higher education has increased steadily. This paper examines whether foreign-born peers affect the likelihood American college students graduate with a STEM major. Using administrative student records from a large public university in Califor...

Fudenberg and Harris’ stochastic version of the classical replicator dynamics is considered. The behavior of this diffusion process in the presence of an evolutionarily stable strategy is investigated. Moreover, extinction of dominated strategies and stochastic stability of strict Nash equilibria are studied. The general results are illustrated in connection with a discrete war of attrition. A ...

This paper studies free-riding incentives on common environmental resources in an incomplete information repeated game where abatements are perishable and perfect substitutes. Two contrasting types of perfect Bayesian equilibria emerge: For high discount factors, or low discount factors but ‘‘pessimistic’’ prior beliefs, the inclusion of incomplete information has no impact on the pattern of ab...

The paper presents an approach which thoroughly assesses the role of early life and contemporaneous macro-conditions in explaining health at older ages. In particular, we investigate the role of exposure to infectious diseases and economic conditions during infancy and childhood, as well as the effect of current health care facilities. Specific attention is paid to the impact of unobserved hete...

Student attrition is of particular concern in the field of ICT because the industry faces staffing shortfalls, generally and a noticeable lack of female employees. This paper explores the reasons students give for leaving their ICT courses and examines gender differences in them. An online survey of early leavers from four Australian universities was conducted. The results show that, for many s...

This article describes a national teaching project which set out to address the problem of high student attrition and failure in a érst-year introductory chemistry topic, through the introduction of a student-focused learning-to-learn program presented in context and which uses authentic course materials. The program focused on developing students’ understanding of the learning process and of t...

Language loss is a pressing concern for many of the world's languages. A major obstacle to the early diagnosis of language loss and to the assessment of language maintenance efforts is the absence of an easy-to-use psycholinguistic measure of language strength. We have developed a series of simple psycholinguistic tasks that exploit the fact that the relative strength of two languages is reflec...