This study combines two streams of literature – text representation and machine learning-based causal inference, to study how to represent text as data to improve causal inference, i.e., estimating treatment effects more accurately. We choose a real problem context, Yelp reviews, to...

Ridesharing has become popular over the last decade, bringing significant changes to residents’ travel patterns and city traffic. Relevant to the growth and impact of ridesharing activities in populous urban areas are the side effects, such as air pollution and traffic congestion. Despite a...

In recent years, powder coatings are capturing more of the liquid coatings market due to their economical, ecological, environmental, and energy-saving benefits, yet their low surface qualities still hinder their wider application. In this study, ultrafine powder coatings (~ 20 µm in size) were...

Exploiting the intelligent stimuli-responsive fluorescent materials, which can selectively recognize lysozyme in fingerprints and enable high-contrast imaging, is still a challenge in detecting latent fingerprints (LFPs). Herein, aptamer functionalization and high-contrast reversible dual-color...

In this paper, we forecast Bitcoin's returns and return jumps using a self-exciting process embedded in a stochastic volatility model. We show the existence of the jump clustering feature, which varies depending on the frequency of the data. In an out-of-sample setting, we use a particle filter...

This paper proposes an aggregate index of macro tail risk and examines its role in asset pricing. We observe that a positive market risk premium compensated for the downside risk of macro fundamentals; a high tail risk predicts subsequent high returns. This predictability exists both in- and...

Using a novel data set based on individual resumes of public firm employees, we propose a monthly index of aggregate labor flow that measures the dynamics of firm employment. We find that the index can predict the economic outputs significantly: an increase in the index leads to greater...