In this paper a semiparametric fixed effect estimator is proposed in a partial linear model. The estimator is applied to study the immigrants home-link effect on the U.S. producer trade flows with the home country of the immigrant. The results from this study show that the immigrants support the...

A unified framework for various nonparametric kernel regression estimators is presented, based on which we consider two nonparametric tests for neglected nonlinearity in time series regression models. One of them is the goodness-of-fit test of Cai, Fan, and Yao (2000) and another is the...