论文标题
Google Scholar，Microsoft Academic，Scopus，Dimensions，Web of Science和Opencitations的COCI：通过引用的覆盖范围的多学科比较
Google Scholar, Microsoft Academic, Scopus, Dimensions, Web of Science, and OpenCitations' COCI: a multidisciplinary comparison of coverage via citations
论文作者
论文摘要
最近已获得了新的引文数据来源，例如Microsoft学术，维度和CrossRef Open Doi-doi-Doi引文（COCI）的关注指数。尽管这些已与科学网络（WOS），Scopus或Google Scholar进行了比较，但没有系统的证据表明它们在主题类别中的差异。作为回应，本文调查了这六个数据源发现的3,073,351篇引用到2006年252个主题类别发表的2,515个英语高度引用的文档，从而扩大和更新了最大的先前研究。 Google Scholar发现了所有引用中的88％，其中许多是由其他来源发现的，几乎所有引用。大多数主题类别中的类似模式。 Microsoft Academic是第二大总体（占所有引用的60％），其中包括82％的Scopus引用和86％的Web of Science引文。在大多数类别中，微软学者发现的引用比Scopus和Wos（分别为182和223个主题类别），但在某些领域（例如物理学和某些人文科学类别）的覆盖差距。在Scopus之后，尺寸是第四大（所有引用的54％），包括84％的Scopus引用和88％的WOS引用。它发现了36个类别的scopus的引用多于Scopus，比185年的WOS更多，并且显示了一些覆盖差距，尤其是人文科学。在WOS之后，COCI是最小的，其中28％的引用。 Google Scholar仍然是最全面的来源。在许多主题类别中，Microsoft学术和维度是Scopus和Wos的良好替代方案。
New sources of citation data have recently become available, such as Microsoft Academic, Dimensions, and the OpenCitations Index of CrossRef open DOI-to-DOI citations (COCI). Although these have been compared to the Web of Science (WoS), Scopus, or Google Scholar, there is no systematic evidence of their differences across subject categories. In response, this paper investigates 3,073,351 citations found by these six data sources to 2,515 English-language highly-cited documents published in 2006 from 252 subject categories, expanding and updating the largest previous study. Google Scholar found 88% of all citations, many of which were not found by the other sources, and nearly all citations found by the remaining sources (89%-94%). A similar pattern held within most subject categories. Microsoft Academic is the second largest overall (60% of all citations), including 82% of Scopus citations and 86% of Web of Science citations. In most categories, Microsoft Academic found more citations than Scopus and WoS (182 and 223 subject categories, respectively), but had coverage gaps in some areas, such as Physics and some Humanities categories. After Scopus, Dimensions is fourth largest (54% of all citations), including 84% of Scopus citations and 88% of WoS citations. It found more citations than Scopus in 36 categories, more than WoS in 185, and displays some coverage gaps, especially in the Humanities. Following WoS, COCI is the smallest, with 28% of all citations. Google Scholar is still the most comprehensive source. In many subject categories Microsoft Academic and Dimensions are good alternatives to Scopus and WoS in terms of coverage.
