There are two variance components embedded in the returns constructed using high-frequency asset prices: the time-varying variance of the unobservable efficient returns that would prevail in a frictionless economy and the variance of the equally unobservable microstructure noise. Using sample moments of high-frequency return data recorded at different frequencies, we provide a simple and robust...

This study examines the relationship between ownership structure and firm performance in Chinese companies. We hand collected ownership data on 1178 non-financial companies with a total of 5815 firm-years from annual reports. Through fixed-effect panel model, this study has the following findings. First, there is a positive relationship between firm performance and institutional ownership in Ch...

Scalable Ensemble Learning and Computationally Efficient Variance Estimation

The paper reports micro-econometric evidence on the factors that influence the ability of the small businesses to create employment. It uses data on self-employment from a British panel survey. In particular it investigates the contributions of financial and entrepreneurial capital to job creation. Housing wealth appears to be significantly associated with small business job creation. It appear...

Using state-level data from the Behavioral Risk Factor Surveillance System, we investigate the effects of household food-away-from-home and food-at-home expenditures on overweight rates, obesity rates, and combined rates. Our random effects model estimates suggest that food-away-from-home expenditures are positively related to obesity and combined rates, while food-at-home expenditures are nega...

While many studies have affirmed the contributions of information technology (IT) to business value, people are not convinced. So far IT in the service industry has not yet been seen to be more productive. The data in most previous studies either focus on specific industries or exclude financial industry data. As such, the need to do an analysis on IT productivity in the service industry is imm...

Multiple sequential recurrences are one of themost important characteristics of superficial transitional cell carcinoma of the bladder, more than 50% of the patients will have recurrences (reappearance of a new superficial tumor). When in the same subject recurrent events are considered and these observed events are clustered into groups, independence between the clustered survival times cannot...