iCite Database Snapshot 2022-11

This is a database snapshot of the iCite web service (provided here as a single zipped CSV file, or compressed, tarred JSON files). In addition, citation links in the NIH Open Citation Collection are provided as a two-column CSV table in open_citation_collection.zip. iCite provides bibliometrics and metadata on publications indexed in PubMed, organized into three modules: <br> Influence: Delivers metrics of scientific influence, field-adjusted and benchmarked to NIH publications as the baseline. <br> Translation: Measures how Human, Animal, or Molecular/Cellular Biology-oriented each paper is; tracks and predicts citation by clinical articles <br> Open Cites: Disseminates link-level, public-domain citation data from the NIH Open Citation Collection <br> Definitions for individual data fields: <br> pmid: PubMed Identifier, an article ID as assigned in PubMed by the National Library of Medicine <br> doi: Digital Object Identifier, if available <br> year: Year the article was published <br> title: Title of the article <br> authors: List of author names <br> journal: Journal name (ISO abbreviation) <br> is_research_article: Flag indicating whether the Publication Type tags for this article are consistent with that of a primary research article <br> relative_citation_ratio: Relative Citation Ratio (RCR)--OPA's metric of scientific influence. Field-adjusted, time-adjusted and benchmarked against NIH-funded papers. The median RCR for NIH funded papers in any field is 1.0. An RCR of 2.0 means a paper is receiving twice as many citations per year than the median NIH funded paper in its field and year, while an RCR of 0.5 means that it is receiving half as many citations per year. Calculation details are documented in Hutchins et al., PLoS Biol. 2016;14(9):e1002541. <br> provisional: RCRs for papers published in the previous two years are flagged as "provisional", to reflect that citation metrics for newer articles are not necessarily as stable as they are for older articles. Provisional RCRs are provided for papers published previous year, if they have received with 5 citations or more, despite being, in many cases, less than a year old. All papers published the year before the previous year receive provisional RCRs. The current year is considered to be the NIH Fiscal Year which starts in October. For example, in July 2019 (NIH Fiscal Year 2019), papers from 2018 receive provisional RCRs if they have 5 citations or more, and all papers from 2017 receive provisional RCRs. In October 2019, at the start of NIH Fiscal Year 2020, papers from 2019 receive provisional RCRs if they have 5 citations or more and all papers from 2018 receive provisional RCRs. <br> citation_count: Number of unique articles that have cited this one <br> citations_per_year: Citations per year that this article has received since its publication. If this appeared as a preprint and a published article, the year from the published version is used as the primary publication date. This is the numerator for the Relative Citation Ratio. <br> field_citation_rate: Measure of the intrinsic citation rate of this paper's field, estimated using its co-citation network. <br> expected_citations_per_year: Citations per year that NIH-funded articles, with the same Field Citation Rate and published in the same year as this paper, receive. This is the denominator for the Relative Citation Ratio. <br> nih_percentile: Percentile rank of this paper's RCR compared to all NIH publications. For example, 95% indicates that this paper's RCR is higher than 95% of all NIH funded publications. <br> human: Fraction of MeSH terms that are in the Human category (out of this article's MeSH terms that fall into the Human, Animal, or Molecular/Cellular Biology categories) <br> animal: Fraction of MeSH terms that are in the Animal category (out of this article's MeSH terms that fall into the Human, Animal, or Molecular/Cellular Biology categories) <br> molecular_cellular: Fraction of MeSH terms that are in the Molecular/Cellular Biology category (out of this article's MeSH terms that fall into the Human, Animal, or Molecular/Cellular Biology categories) <br> x_coord: X coordinate of the article on the Triangle of Biomedicine <br> y_coord: Y Coordinate of the article on the Triangle of Biomedicine <br> is_clinical: Flag indicating that this paper meets the definition of a clinical article. <br> cited_by_clin: PMIDs of clinical articles that this article has been cited by. <br> apt: Approximate Potential to Translate is a machine learning-based estimate of the likelihood that this publication will be cited in later clinical trials or guidelines. Calculation details are documented in Hutchins et al., PLoS Biol. 2019;17(10):e3000416. <br> cited_by: PMIDs of articles that have cited this one. <br> references: PMIDs of articles in this article's reference list. <br> Large CSV files are zipped using zip version 4.5, which is more recent than the default unzip command line utility in some common Linux distributions. These files can be unzipped with tools that support version 4.5 or later such as 7zip. <br> Comments and questions can be addressed to [e-mail]

本数据集为iCite网络服务的数据库快照，本次提供的文件为单个压缩ZIP格式CSV文件，或经tar打包压缩的JSON文件。此外，NIH开放引文集合（NIH Open Citation Collection）中的引文链接以两栏式CSV表格的形式存储于open_citation_collection.zip压缩包中。

iCite可为PubMed收录的出版物提供文献计量学指标与元数据，共分为三大模块：
影响力（Influence）：提供经领域校正、以NIH资助出版物为基准的科学影响力计量指标。
转化性（Translation）：衡量每篇论文的研究方向偏向人类、动物还是分子/细胞生物学；追踪并预测临床类文章对其的引用情况。
开放引文（Open Cites）：发布来自NIH开放引文集合的、可公开获取的链路级引文数据。

各数据字段定义如下：
- pmid：PubMed标识符（PubMed Identifier，PMID），即美国国立医学图书馆在PubMed中分配的文章编号。
- doi：数字对象标识符（Digital Object Identifier），若文章可获取则提供该信息。
- year：文章发表年份。
- title：文章标题。
- authors：作者姓名列表。
- journal：期刊名称（采用ISO缩写格式）。
- is_research_article：标记字段，用于指示该文章的出版物类型标签是否符合原创研究文章的定义。
- relative_citation_ratio：相对引文比率（Relative Citation Ratio，RCR）——美国国立卫生研究院的科学影响力计量指标。该指标经领域与时序校正，并以NIH资助论文为基准。任意领域内NIH资助论文的RCR中位数为1.0。若RCR为2.0，则代表该文章每年获得的引文数是其所属领域及发表年份下NIH资助论文中位数的2倍；若RCR为0.5，则代表其每年获得的引文数仅为该中位数的一半。该指标的计算细节可参考Hutchins等人发表于*PLoS Biol*. 2016;14(9):e1002541的研究。
- provisional：针对近两年发表的论文，其RCR会被标记为“临时”，以反映较新文章的引文计量指标稳定性不如老旧文章。若近一年发表的论文获得5次及以上引文，即便发表时长不足一年，也会提供临时RCR。上一年度发表的所有论文均会被赋予临时RCR。当前年度以NIH财政年度为准，该年度始于每年10月。示例：2019年7月（属于NIH 2019财年）时，2018年发表的论文若获得5次及以上引文，则会被标记临时RCR，且2017年发表的所有论文均会被赋予临时RCR。2019年10月，即NIH 2020财年伊始，2019年发表的论文若获得5次及以上引文则会被标记临时RCR，且2018年发表的所有论文均会被赋予临时RCR。
- citation_count：引用该文章的唯一文献数量。
- citations_per_year：该文章自发表以来每年获得的平均引文数。若文章同时以预印本和正式出版物形式发布，则以正式版本的发表年份作为主要出版日期。该指标是相对引文比率的分子项。
- field_citation_rate：基于文章的共引网络估算得到的、该文章所属领域的固有引文率。
- expected_citations_per_year：与本文发表年份相同、且具有相同领域引文率的NIH资助论文每年获得的平均引文数。该指标是相对引文比率的分母项。
- nih_percentile：该文章的RCR在所有NIH资助出版物中的百分位排名。例如，95%代表该文章的RCR高于95%的NIH资助出版物。
- human：属于人类（Human）类别的医学主题词（Medical Subject Headings, MeSH）占该文章所有归入人类、动物或分子/细胞生物学类别的医学主题词的比例。
- animal：属于动物（Animal）类别的医学主题词占该文章所有归入上述三类主题词的比例。
- molecular_cellular：属于分子/细胞生物学（Molecular/Cellular Biology）类别的医学主题词占该文章所有归入上述三类主题词的比例。
- x_coord：文章在生物医学三角（Triangle of Biomedicine）中的X轴坐标。
- y_coord：文章在生物医学三角中的Y轴坐标。
- is_clinical：标记字段，用于指示该文章符合临床类文章的定义。
- cited_by_clin：引用该文章的临床类文章的PMID列表。
- apt：转化近似潜力（Approximate Potential to Translate，APT）：基于机器学习的估算值，用于预测该出版物在后续临床试验或指南中被引用的可能性。其计算细节可参考Hutchins等人发表于*PLoS Biol*. 2019;17(10):e3000416的研究。
- cited_by：引用该文章的文献的PMID列表。
- references：该文章参考文献列表中所收录文献的PMID列表。

本数据集的大型CSV文件采用ZIP 4.5版本进行压缩，该版本较部分常见Linux发行版默认的unzip命令行工具更新。此类文件可使用支持ZIP 4.5及以上版本的解压工具（如7zip）进行解压。

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