This paper studies the robust estimation and inference of threshold models with integrated regres- sors. We derive the asymptotic distribution of the profiled least squares (LS) estimator under the diminishing threshold effect assumption that the size of the threshold effect converges to zero....

We uncover interesting opposite effects of jumps in stock prices on three kind of stock returns: close-to-close expected return, and its two components, namely overnight and intraday return, when heterogeneous investors are confronted with different types of news during trading hours and...

This paper considers estimation and inference for varying-coefficient models with nonstationary regressors. We propose a nonparametric estimation method using penalized splines, which achieves the same optimal convergence rate as kernel-based methods, but enjoys computation advantages. Utilizing...