We show that the quantile regression estimator is consistent and asymptotically normal when the error terms are correlated within clusters but independent across clusters. A consistent estimator of the covariance matrix of the asymptotic distribution is provided and we propose a specification test capable of detecting the presence of intra-cluster correlation. A small simulation study illustrat...

This paper establishes improved uniform convergence rates for series estimators. Series estimators are least-squares fits of a regression function where the number of regressors depends on sample size. I will specialize my results to the cases of polynomials and regression splines. These results improve upon results obtained earlier by Newey, yet fail to attain the optimal rates of convergence....

This note describes methods to test for distributional treatment effects under the conditional independence assumption. The differences between latent outcome distributions are judged by testing hypotheses of distributional equality and stochastic dominance. Furthermore, semiparametric efficient versions of the test statistics are given. The latter test statistics are double robust, i.e., they ...

This work was funded by the Spanish Ministry of Economy and Competiveness (Project MEDSHIFT, CGL2015-71809-P), Science, Innovation Universities (SUMAECO, RTI2018-095441-B-C21) King Abdullah University for Science Technology (3834 KAUST-CSIC Research Collaboration base line funding to CMD). We thank Ioannis Savva, Julius Glampedakis, Scott Bennet Raquel Vaquer-Sunyer field assistance Joan Manuel...

The purpose of the research was to assess changes in lactation activity cows and their impact on level reproduction, as well study fluctuations with respect genetic environmental factors. A sample 807 various ages formed for study. were kept a commercial farm Kharkiv region, Ukraine. Data from DairyPlan C21 software used It revealed that parameters Wood curve model significantly influenced by c...