This study is one of the first that uses the recently introduced open access (OA) labels in the Web of Science (WoS) metadata to investigate whether OA articles published in Directory of Open Access Journals (DOAJ) listed journals experience a citation advantage in comparison to subscription journal articles, specifically those of which no self-archived versions are available. Bibliometric data on all articles and reviews indexed in WoS, and published from 2013 to 2015, were analysed. In addition to normalised citation score (NCS), we used two additional measures of citation advantage: whether an article was cited at all; and whether an article is among the most frequently cited percentile of articles within its respective subject area (pptopX %). For each WoS subject area, the strength of the relationship between access status (whether an article was published in an OA journal) and each of these three measures was calculated. We found that OA journal articles experience a citation advantage in very few subject areas and, in most of these subject areas, the citation advantage was found on only a single measure of citation advantage, namely whether the article was cited at all. Our results lead us to conclude that access status accounts for little of the variability in the number of citations an article accumulates. The methodology and the calculations that were used in this study are described in detail and we believe that the lessons we learnt, and the recommendations we make, will be of much use to future researchers interested in using the WoS OA labels, and to the field of citation advantage in general.

中文翻译：

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开放获取期刊文章是否具有引用优势？将多种测量应用于 WoS 主题领域分析的结果和方法论反思

本研究是最早使用科学网 (WoS) 元数据中最近引入的开放获取 (OA) 标签来调查在开放获取期刊目录 (DOAJ) 列出的期刊中发表的 OA 文章是否具有引用优势的研究之一订阅期刊文章，特别是那些没有自存档版本的文章。对 2013 年至 2015 年在 WoS 中编入索引并发表的所有文章和评论的文献计量数据进行了分析。除了归一化引文得分 (NCS) 之外，我们还使用了两个额外的引文优势衡量标准：一篇文章是否被引用；以及一篇文章是否属于其各自主题领域内最常被引用的文章百分比 (pptopX %)。对于每个 WoS 学科领域，计算了访问状态（文章是否发表在 OA 期刊上）与这三个指标中的每一个之间的关系强度。我们发现 OA 期刊文章在极少数学科领域具有引用优势，并且在大多数这些学科领域中，引用优势仅在引用优势的一个衡量标准上被发现，即文章是否被引用。我们的结果使我们得出结论，访问状态几乎不能解释一篇文章累积的引用次数的变化。详细描述了本研究中使用的方法和计算，我们相信我们学到的经验教训和我们提出的建议将对未来有兴趣使用 WoS OA 标签的研究人员以及该领域大有帮助的引用优势。