摘要
First,we would like to express our sincere gratitude to all the authors,supporters,editorial board members of the journal Statistical Theory and Related Fields.In this second issue of 2018,three types of articles are published,(1)a review paper on nonignorable missing data problems followed by five papers of discussions and an author’s rejoinder;(2)six original articles on statistical methodology and applications;and(3)a new created Statistics Column containing three articles related to an international statistics conference held in June 2018.
