iCite Database Snapshot 2023-05

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: Influence: Delivers metrics of scientific influence, field-adjusted and benchmarked to NIH publications as the baseline. Translation: Measures how Human, Animal, or Molecular/Cellular Biology-oriented each paper is; tracks and predicts citation by clinical articles Open Cites: Disseminates link-level, public-domain citation data from the NIH Open Citation Collection Definitions for individual data fields: pmid: PubMed Identifier, an article ID as assigned in PubMed by the National Library of Medicine doi: Digital Object Identifier, if available year: Year the article was published title: Title of the article authors: List of author names journal: Journal name (ISO abbreviation) is_research_article: Flag indicating whether the Publication Type tags for this article are consistent with that of a primary research article 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. 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. citation_count: Number of unique articles that have cited this one 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. field_citation_rate: Measure of the intrinsic citation rate of this paper's field, estimated using its co-citation network. 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. 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. 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) 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) 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) x_coord: X coordinate of the article on the Triangle of Biomedicine y_coord: Y Coordinate of the article on the Triangle of Biomedicine is_clinical: Flag indicating that this paper meets the definition of a clinical article. cited_by_clin: PMIDs of clinical articles that this article has been cited by. 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. cited_by: PMIDs of articles that have cited this one. references: PMIDs of articles in this article's reference list. 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. Comments and questions can be addressed to [e-mail]

本数据集为iCite网页服务的数据库快照，提供形式为单个压缩CSV文件，或经tar打包压缩的JSON文件。此外，美国国立卫生研究院（National Institutes of Health, NIH）开放引文合集（NIH Open Citation Collection）中的引文链接，以两列CSV表格的形式存放在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，分为以下三个模块：
1. **影响力模块**：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；
2. **转化模块**：衡量每篇论文偏向人类、动物或分子/细胞生物学的程度，并追踪、预测临床类文章对其的引用情况；
3. **开放引文模块**：发布来自NIH开放引文合集的链接级公共领域引文数据。

### 各数据字段定义：
pmid：PubMed标识符（PubMed Identifier），即美国国立医学图书馆（National Library of Medicine）在PubMed中分配的文章编号。
doi：数字对象标识符（Digital Object Identifier），若文章有提供则显示该字段。
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标准缩写）。
is_research_article：标记字段，用于指示本文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项目办公室（OPA）的科学影响力计量指标。该指标经领域与时间校正，以NIH资助论文为基准进行对标。任意领域内NIH资助论文的RCR中位数为1.0：若RCR为2.0，则代表本文年均被引次数为本领域同年度NIH资助论文中位数的2倍；若RCR为0.5，则代表年均被引次数仅为中位数的一半。该指标的计算细节详见Hutchins等人发表于*PLoS Biol.* 2016;14(9):e1002541的研究。
provisional：针对前两年发表的论文，其RCR将被标记为「暂定」，以反映新发表文章的引文指标稳定性不及旧文章。若前一年发表的论文获得至少5次引用，即便发表时长不足一年，也会提供暂定RCR；上上个年度发表的所有论文均会提供暂定RCR。当前年度定义为NIH财年，起始于每年10月。例如，在2019年7月（NIH 2019财年），2018年发表且被引≥5次的论文将被标记为暂定RCR，且2017年发表的所有论文均会提供暂定RCR；在2019年10月（NIH 2020财年启动时），2019年发表且被引≥5次的论文将被标记为暂定RCR，且2018年发表的所有论文均会提供暂定RCR。
citation_count：唯一引用本文的文章总数。
citations_per_year：本文自发表以来的年均被引次数。若本文同时以预印本和正式出版物形式发布，则以正式出版物的发表年份作为主要发表日期。该指标为相对引文比率的分子项。
field_citation_rate：本文所属领域的固有被引速率评估值，通过本文的共引网络估算得到。
expected_citations_per_year：与本文具有相同领域被引速率且发表于同一年度的NIH资助论文的年均被引次数。该指标为相对引文比率的分母项。
nih_percentile：本文RCR在所有NIH资助出版物中的百分位排名。例如，百分位为95%代表本文的RCR高于95%的NIH资助论文。
human：本文医学主题词（Medical Subject Headings, MeSH）中属于「人类」类别的占比（仅统计归入人类、动物或分子/细胞生物学类别的MeSH词）。
animal：本文医学主题词中属于「动物」类别的占比（仅统计归入人类、动物或分子/细胞生物学类别的MeSH词）。
molecular_cellular：本文医学主题词中属于「分子/细胞生物学」类别的占比（仅统计归入人类、动物或分子/细胞生物学类别的MeSH词）。
x_coord：本文在「生物医学三角（Triangle of Biomedicine）」中的X轴坐标。
y_coord：本文在「生物医学三角」中的Y轴坐标。
is_clinical：标记字段，用于指示本文符合临床文章的定义。
cited_by_clin：引用本文的临床文章的PubMed编号列表。
apt：近似转化潜力（Approximate Potential to Translate, APT）：基于机器学习的评估指标，用于估算本文在后续临床试验或临床指南中被引用的可能性。该指标的计算细节详见Hutchins等人发表于*PLoS Biol.* 2019;17(10):e3000416的研究。
cited_by：引用本文的所有文章的PubMed编号列表。
references：本文参考文献列表中收录的文章的PubMed编号列表。

### 解压说明：
大型CSV文件采用zip 4.5版本压缩，该版本较部分主流Linux发行版默认的unzip命令行工具更新，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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