The purpose of this study was to examine the potential for using propensity score-based matching methods to estimate teacher contributions to student learning. Value-added models are increasingly used in teacher accountability systems in the United States in spite of ongoing qualms about the validity of teacher quality estimates resulting from…

Cloud computing offers the advantage of on-demand, reliable and cost efficient computing solutions without the capital investment and management resources to build and maintain in-house data centers and network infrastructures. Scalability of cloud solutions enable consumers to upgrade or downsize their services as needed. In a cloud environment,…

This study considered whether participation in several out-of-class experiences during high school influenced the odds that a student will aspire to earn at least a Bachelor's degree. Additionally, this study considered whether these experiences, considered together, had a cumulative effect on the odds that a student will aspire to earn at least a…

This research examines issues regarding model estimation and robustness in the use of Bayesian Inference Networks (BINs) for measuring Learning Progressions (LPs). It provides background information on LPs and how they might be used in practice. Two simulation studies are performed, along with real data examples. The first study examines the case…

This dissertation is comprised of three essays, all of which focus on various impacts of economic recession. The first two essays utilize county-level data to examine differences between rural and urban response to economic downturn, while the final essay makes use of individual-level data to examine the impact of recession on enrollment in higher…

Educational attainment sits at the core of research on social stratification in the United States. An extensive literature details the inequalities in access to levels of education, the socioeconomic rewards conferred upon those reaching higher levels of schooling, and the prospects for social mobility among those able to attain a college degree.…

Collaborative functionality is changing the way information is amassed, refined, and disseminated in online environments. A subclass of these systems characterized by "open collaboration" uniquely allow participants to "modify" content with low barriers-to-entry. A prominent example and our case study, English Wikipedia,…

This dissertation aims to extend our knowledge of prosody--in particular, what kinds of information may be conveyed through prosody, which prosodic dimensions may be used to convey them, and how individual speakers differ from one another in how they use prosody. Four production studies were conducted to examine how various factors interact with…

We live in an era of information overload. From online news to online shopping to scholarly research, we are inundated with a torrent of information on a daily basis. With our limited time, money and attention, we often struggle to extract actionable knowledge from this deluge of data. A common approach for addressing this challenge is…

Propensity score analysis has been used to minimize the selection bias in observational studies to identify causal relationships. A propensity score is an estimate of an individual's probability of being placed in a treatment group given a set of covariates. Propensity score analysis aims to use the estimate to create balanced groups, akin to a…

This dissertation study focuses on a current and controversial phenomenon in Chinese universities and colleges--student working during academic semesters. The massification of Chinese higher education since the year of 1999 raises the level of competition in the job market of college graduates. More and more undergraduate students participate in…

This study aims to explore the impact of college quality on early labor market outcomes in China, including the fresh college graduates' initial employment status and starting wages for students who graduated in 2011. The main data source is the College Student Labor Market (CSLM) survey conducted by Tsinghua University. Distinguished from…

The importance of subscores in educational and psychological assessments is undeniable. Subscores yield diagnostic information that can be used for determining how each examinee's abilities/skills vary over different content domains. One of the most common criticisms about reporting and using subscores is insufficient reliability of subscores.…

This dissertation is composed of three distinct chapters, each of which addresses issues of estimating treatment effects. The first chapter empirically tests the Value-Added (VA) model using school lotteries. The second chapter, co-authored with Michael Wood, considers properties of inverse probability weighting (IPW) in simple treatment effect…

Behavioral feeding difficulties occur at a high rate in children with autism spectrum disorders (ASD) and can have a serious impact on their overall health and development. Although there are a number of studies demonstrating effective strategies for addressing behavioral feeding difficulties in children with ASD, the majority of them have been…