Elsevier embargo periods, 2013-2017

This dataset contains all journal embargo periods published by Elsevier in 2013, 2014, 2015, 2016, and 2017, for both UK and non-UK authors. It also contains a set of notes on the overall statistics and annual changes between lists.<br> In summary, 88.5% of currently published Elsevier journals (in late 2017) offer a twelve-month or less embargo period for UK authors, and 60.5% for non-UK authors. Since the first general list was published in 2013, the general trend has been to add more journals to the list and (gradually) lower embargo periods; in 2015 and 2016 this has included a substantial increase in zero-embargo titles. The majority of journals have a stated embargo period and in most cases it has been reasonably stable since 2015.<br> A number of substantial anomalies developed between the lists in 2013 and 2014, with journals being removed or having their embargo periods extended. These have since been created, but around a dozen mismatches have reappeared in the December 2017 version of the lists.

本数据集收录了爱思唯尔（Elsevier）2013至2017年间发布的、面向英国（UK）及非英国作者的全部期刊禁运期限（embargo period）数据，同时包含各版本列表的整体统计信息与年度变化说明。<br>综上，截至2017年末，爱思唯尔当前发行的期刊中，88.5%可为英国作者提供12个月及以内的禁运期限，非英国作者的对应占比为60.5%。自2013年首份通用列表发布以来，整体趋势为不断扩充收录期刊范围，并（逐步）缩短禁运期限；2015年与2016年间，零禁运期刊的数量大幅增长便是该趋势的典型体现。绝大多数期刊均明确标注了禁运期限，且自2015年起，多数期刊的禁运期限保持相对稳定。<br>2013至2014年的各列表版本间出现多起显著异常，部分期刊被移除或禁运期限被延长。此类异常后续已得到修正，但在2017年12月的列表版本中仍有约12处不匹配情况重现。