Choosing a Valid Assessment of Attachment for Clinical Use: A Comparative Study

This article addresses the clinical issue of selecting assessments of attachment that are relevant to decision making for families. The validity of three commonly used methods of assessing attachment in preschool‐aged children was compared using a sample of 51 low‐income mother—child dyads. Thirty‐eight of the children had been abused or neglected. The dyads were seen in a Strange Situation that was classified using each of the three methods: (a) the Ainsworth‐extended method, (b) the Cassidy‐Marvin (C‐M) method, and (c) the Preschool Assessment of Attachment (PAA). Validity was evaluated in terms of maltreatment status, maternal sensitivity, child DQ, and maternal attachment strategy. The PAA and C‐M classifications matched in only 37% of cases. The Ainsworth‐extended method differentiated secure versus insecure children on two variables. The CM method differentiated secure versus insecure children on one variable. The PAA differentiated secure versus insecure children on all four variables and subgroups on one. Moreover, it was tied to other family relationship variables in meaningful ways. If applied in clinical settings, these three methods would result in very different groups of children being seen as safe and at risk. We argue that clinicians cannot afford to be uninformed about the validity of alternative means of assessing attachment.     

Differences in Internalizing Symptoms Anticipate Adolescent Friendship Dissolution

This study examined the degree to which internalizing symptoms predict adolescent friendship instability. A total of 397 adolescents identified 499 same‐sex reciprocated friendships that originated in the seventh grade (M = 13.18 years). Discrete‐time survival analyses were conducted with Grade 7 peer, teacher, and self‐reports of internalizing symptoms as predictors of friendship dissolution across Grades 8–12. Differences between friends in depressive symptoms, anxiety symptoms, and (for boys only) submissiveness predicted subsequent friendship dissolution. Individual levels of these variables did not predict friendship dissolution, even at extreme or clinical levels. The findings suggest that friendship instability arising from internalizing problems stems from dissimilarity between friends rather than the presence of psychopathological symptoms on the part of one friend.     

Nature-inspired metaheuristics for multiobjective activity crashing

Many project tasks and manufacturing processes consist of interdependent time-related activities that can be represented as networks. Deciding which of these sub-processes should receive extra resources to speed up the whole network (i.e., where activity crashing should be applied) usually involves the pursuit of multiple objectives amid a lack of a priori preference information. A common decision support approach lies in first determining efficient combinations of activity crashing measures and then pursuing an interactive exploration of this space. As it is impossible to exactly solve the underlying multiobjective combinatorial optimization problem within a reasonable computation time for real-world problems, we have developed proper solution procedures based on three major (nature-inspired) metaheuristics. This paper describes these implementations, discusses their strengths, and provides results from computational experiments.     

Nonparametric change point estimation for survival distributions with a partially constant hazard rate

Lifetime Data Analysis - We present a new method for estimating a change point in the hazard function of a survival distribution assuming a constant hazard rate after the change point and a...