A Markov Chain for calculating the durability of marriage

The usual Markov model of marriage permits informative experiments on the effect of alterations in the transition rules. It can tell, for example, what difference it would make to the durability of marriage if there was no divorce and the other transitions were as observed. This is in addition to the capacity of the usual model to find the effect of small changes in the transition rates.

Canadian data for 1970–1982 permit comparisons over time, and show among other things not only that married men live longer than single, but that the difference is increasing; the increase in the “marriage bonus”; over time also appears for women.     

The Effects of Early Institutionalization and Foster Care Intervention on Children's Social Behaviors at the Age of Eight

The present study compared the social behaviors of eight‐year‐old previously institutionalized Romanian children from the Bucharest Early Intervention Project (BEIP) in two groups: (1) children randomized to foster care homes (FCG), and (2) children randomized to care as usual (remaining in institutions) (CAUG). Children were observed interacting with an age‐ and gender‐matched unfamiliar, non‐institutionalized peer from the community during six interactive tasks, and their behavior was coded for speech reticence, social engagement, task orientation, social withdrawal, and conversational competence. Group comparisons revealed that FCG children were rated as significantly less reticent during a speech task than CAUG children. For CAUG children, longer time spent in institutional care was related to greater speech reticence and lower social engagement. Using an actor–partner interdependence model, CAUG children's behaviors, but not FCG, were found to influence the behavior of unfamiliar peers. These findings are the first to characterize institutionalized children's observed social behaviors toward new peers during middle childhood and highlight the positive effects of foster care intervention in the social domain.     

Reactive Temperament and Sensitivity to Context in Childcare

Consistent with Biological Sensitivity to Context and Differential Susceptibility hypotheses, this study found that children who, as infants, were more temperamentally reactive were more sensitive to the quality of childcare they experienced as toddlers, but not to the amount of childcare with peers they had experienced since birth. Children with both highly positively and negatively reactive temperaments were more socially integrated when care quality was higher and less integrated when care quality was lower compared with moderately reactive children. Reactive temperament was not found to moderate relations between care quality or care duration and internalizing or externalizing behavior problems. These findings support the need to consider individual differences among children in evaluating the impacts of childcare.     

The influence of exurban landscapes and local site characteristics on riparian vegetation

The southern Appalachian Mountains have experienced large population growth and a change in land use in the past 30 years. The majority of development has been low density, suburban land, known as exurban development. The long-term effects of exurbanization on riparian vegetative communities in the southeastern Appalachian Mountains are not well known. We sought to determine if vegetative community composition and structure change as a function of watershed–level variables such as time since neighborhood development or percent impervious surface within the watershed. We also assessed local–scale measures of disturbance such as canopy cover and basal area. Over two years we sampled a total of 27 streams in exurban watersheds ranging in age from four to forty-four years, along with eight forested streams. Watershed–scale variables such as neighborhood age and impervious surface cover did not influence the aspects of riparian vegetation community we measured. Canopy cover, a measure of local habitat disturbance, offered better predictions of vegetation community metrics. Exurban neighborhoods and their landowners may have the potential to manage for riparian vegetation through the use of maintained stream buffer zones along the entire length of the stream.     

Dialogue on Private Events

The Analysis of Verbal Behavior - In the fall of 2003, the authors corresponded on the topic of private events on the listserv of the Verbal Behavior Special Interest Group. Extracts from that...     

Associations Between Family of Origin Climate,Relationship Self‐Regulation,and Marital Outcomes

Using dyadic data from 961 married couples from the Relationship Evaluation Questionnaire project, the current study explored the direct association between family of origin climate and marital outcomes and the indirect association via relationship self‐regulation (RSR). Results from the actor–partner interdependence model analysis indicated that family of origin climate was positively associated with marital stability directly and indirectly via the effects of RSR and marital satisfaction for both men and women. Results suggest that the experience one has in their family of origin is associated with their marital outcomes through their RSR. Actor–partner direct and indirect effects indicate that spouses' RSR may have important consequences for both partner's evaluation of the marriage. Implications for intervention and future research are discussed.     

Scalable Dynamic Bid Prices for Network Revenue Management in Continuous Time

This study develops an approximate optimal control problem to produce time‐dependent bid prices for the airline network revenue management problem. The main contributions of our study are the analysis of time‐dependent bid prices in continuous time and the use of splines to modify the problem into an approximate second‐order cone program (ASOCP). The spline representation of bid prices permits the number of variables to depend solely on the number of resources and not on the size of the booking horizon. The advantage of this framework is the ASOCP's scalability, which we demonstrate by solving for bid prices on an industrial‐sized network. The numerical experiments highlight the ASOCP's ability to solve industrial sized problems in seconds.