Learn More
2008 2 Declaration I hereby declare that my dissertation, entitled " Structured Topic Models for Language " , is not substantially the same as any that I have submitted for a degree or diploma or other qualification at any other university. No part of my dissertation has already been, or is concurrently being, submitted for any degree, diploma, or other(More)
Statistical models of text have become increasingly popular in statistics and computer science as a method of exploring large document collections. Social scientists often want to move beyond exploration, to measurement and experimentation, and make inference about social and political processes that drive discourse and content. In this paper, we develop a(More)
This multimethod research linked the Big-Five personality dimensions to interpersonal conflict in childhood. Agreeableness was the personality dimension of focus because this dimension has been associated with maintaining positive interpersonal relations in adolescents and adults. In two studies, elementary school children were assessed on the Big-Five(More)
Originally designed to model text, topic modeling has become a powerful tool for uncovering latent structure in domains including medicine, finance, and vision. The goals for the model vary depending on the application: in some cases, the discovered topics may be used for prediction or some other downstream task. In other cases, the content of the topic(More)
BACKGROUND Social impairment is a defining feature of autism spectrum disorder (ASD) with no demonstrated effective pharmacologic treatments. The goal of this study was to evaluate efficacy, safety, and tolerability of oral N-acetylcysteine (NAC), an antioxidant whose function overlaps with proposed mechanisms of ASD pathophysiology, targeting core social(More)
OBJECTIVE Stimulant medications, such as methylphenidate (MPH), improve the academic performance of children with attention-deficit hyperactivity disorder (ADHD). However, the mechanism by which MPH exerts an effect on academic performance is unclear. We examined MPH effects on math performance and investigated possible mediation of MPH effects by changes(More)
A multisample, multistudy project aimed at understanding how individual differences in narcissism during early adolescence are related to distortions in the aggression, and the reactivity of the hypothalamic-pituitary-adrenal axis to negative and positive experiences. The findings indicate that individual differences in narcissism are a remarkably stable(More)
There is an increasing realization of the need to share sensitive information across organizational boundaries; much of it in textual form. While search and information retrieval technology has progressed significantly, it assumes an open environment. Providing these capabilities when the information, and the need for that information, are sensitive and(More)
  • 1