In this study I examine the critical factors and themes that are identified as salient influencers of overt and relational aggression among youth. Sex differences and similarities associated with such adolescent perceptions are assessed. Forty-eight ethnically diverse youth between the ages of 14 and 16 years participated in sex-specific focus groups and individual interviews. Sex-Specific Syst...

In this paper, we introduce evidence propagation operations on influence diagrams and a concept of value of evidence, which measures the value of experimentation. Evidence propagation operations are critical for the computation of the value of evidence, general update and inference operations in normative expert systems which are based on the influence diagram (generalized Bayesian network) par...

In recent years, we have witnessed a resurgence of interest in the study of normative influences. The multitude of scholars who approach the topic from a variety of disciplinary perspectives widely share the convention, backed by strong empirical evidence, that social norms exert a great deal of influence on human behavior and that processes of normative influence exist in a variety of contexts...

The work presented here is part of a research project to develop decision-support software for case managers in the Kentucky social welfare system. Welfare case managers help their clients plan participation in activities such as volunteer work, job readiness programs, substance abuse counselling, or study in high school or college, for example. The case manager’s advice is guided by her percep...

In this article we present the framework of Possibilistic Influence Diagrams (PID), which allow to model in a compact form problems of sequential decision making under uncertainty, when only ordinal data on transitions likelihood or preferences are available. The graphical part of a PID is exactly the same as that of usual influence diagrams, however the semantics differ. Transition likelihoods...

Planning for ad hoc teamwork is challenging because it involves agents collaborating without any prior coordination or communication. The focus is on principled methods for a single agent to cooperate with others. This motivates investigating the ad hoc teamwork problem in the context of individual decision making frameworks. However, individual decision making in multiagent settings faces the ...

A new probabilistic network construction system, DYNASTY, is proposed for diagnos­ tic reasoning given variables whose probabil­ ities change over time. Diagnostic reason­ ing is formulated as a sequential stochastic process, and is modeled using influence dia­ grams. Given a set 0 of observations, DY­ NASTY creates an influence diagram in or­ der to devise the best action given 0. Sensi­ tivit...

The distribution of total dissolved iron (DFe) and its chemical speciation were studied in vertical profiles of the shallow and semi-closed Jiaozhou Bay (JZB, China) during two contrasting periods: summer (July 19th, 2011) and spring (May 10th, 2012). Samples collected from the surface, middle and bottom layers were analyzed by competitive ligand exchange-adsorptive cathodic stripping voltammet...

We present a theoretical model of a linear public good game in which heterogeneous players express social approval after observing contributions. The model explains how social approval is expressed and predicts positive contributions if subjects have a preference for social approval. Using a controlled laboratory experiment we test our model. In the experiment, subjects conduct computerized tas...

We outline a method to estimate the value of computation for a flexible algorithm using empirical data. To determine a reasonable trade-off between cost and value, we build an empirical model of the value obtained through computation, and apply this model to estimate the value of computation for quite different problems. In particular, we investigate this trade-off for the problem of constructi...