The Korean high school system is regulated and monitored by then government to ensure that (i) middle school graduates are randomly assigned to private and public high schools and (ii) the tuitions are the same for both institutions. Hence, any difference between the academic performances of the...

This paper proposes methods for estimation and inference in multivariate, multi-quantile models. The theory can simultaneously accommodate models with multiple random variables, multiple confidence levels, and multiple lags of the associated quantiles. The proposed framework can be conveniently...

The development of Global Internet shopping has opened up exciting opportunities for finding new and efficient way of doing businesses. Although the advance in information infrastructure makes connectivity possible to reach almost anywhere in the world, it does not necessarily ensure a...

Engle and Manganelli (2004) propose CAViaR, a class of models suitable for estimating conditional quantiles in dynamic settings. Engle and Manganelli apply their approach to the estimation of Value at Risk, but this is only one of many possible applications. Here we extend CAViaR models to...

Economists have recognized the possibility that a time series may change structure from trend-stationarity to difference-stationarity, or vice versa. Taking difference-stationarity as the null hypothesis, we develop tests for this possibility, where neither the location nor direction of any...