iCite Database Snapshot 2021-11

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，本次提供的文件包括单个压缩的CSV文件，以及经压缩打包的JSON文件。此外，美国国立卫生研究院（National Institutes of Health, NIH）开放引用集合中的引用链接，以双列CSV表格的形式封装于`open_citation_collection.zip`中。
iCite可为PubMed收录的出版物提供文献计量学数据与元数据，其功能分为三大模块：
影响力模块：提供经领域校正、以NIH出版物为基准对照的科学影响力计量指标。
转化模块：量化单篇文献偏向人类医学、动物医学或分子/细胞生物学的程度，并追踪、预测临床文献对其的引用情况。
开放引用模块：发布来自NIH开放引用集合的链路级公共领域引用数据。

各数据字段定义如下：
pmid：PubMed标识符，即美国国立医学图书馆在PubMed中为文献分配的唯一标识编号。
doi：数字对象标识符（Digital Object Identifier），若文献存在该标识则提供。
year：文献出版年份。
title：文献标题。
authors：作者姓名列表。
journal：期刊名称（采用ISO标准缩写）。
is_research_article：布尔标识，用于指示该文献的出版类型标签是否符合原创研究文章的定义。
relative_citation_ratio：相对引用比率（Relative Citation Ratio, RCR）——美国国立卫生研究院相关办公室提出的科学影响力计量指标。该指标经领域与时序校正，并以NIH资助的文献为基准对照。所有领域内NIH资助文献的RCR中位数为1.0：若某文献的RCR为2.0，则代表其每年获得的引用量是对应领域、对应出版年份NIH资助文献中位数的2倍；若RCR为0.5，则代表其每年获得的引用量仅为对应基准的一半。该指标的计算细节详见Hutchins等人发表于《PLOS Biology》2016年;14(9):e1002541的研究。
provisional：出版时间在近两年内的文献，其RCR会被标记为“暂定”，以说明较新文献的引用计量指标稳定性不如已发表较长时间的文献。若出版于上一年的文献获得至少5次引用（即便其发表时长往往不足一年），则会提供暂定RCR；所有出版于前前年的文献均会被赋予暂定RCR。当前年份以NIH的财年为准，其起始时间为每年10月。例如：2019年7月（对应NIH 2019财年）时，2018年发表且引用量≥5次的文献，以及所有2017年发表的文献，均会被标记暂定RCR；2019年10月（NIH 2020财年起始）时，2019年发表且引用量≥5次的文献，以及所有2018年发表的文献，均会被标记暂定RCR。
citation_count：引用该文献的唯一文献总数。
citations_per_year：该文献自出版以来每年获得的平均引用量。若该文献同时以预印本和正式出版版本形式发布，则以正式版本的出版年份作为主出版日期。该指标为相对引用比率的分子项。
field_citation_rate：基于共引网络估算的文献所属领域固有引用率。
expected_citations_per_year：与当前文献拥有相同领域引用率且出版年份一致的NIH资助文献，每年平均获得的引用量。该指标为相对引用比率的分母项。
nih_percentile：该文献的RCR在所有NIH资助文献中的百分位排名。例如，百分位为95%代表该文献的RCR高于95%的NIH资助文献。
human：该文献的医学主题词（Medical Subject Headings, MeSH）中，归属于“人类医学”类别的占比（仅统计归类于人类医学、动物医学或分子/细胞生物学类别的MeSH词）。
animal：该文献的MeSH术语中，归属于“动物医学”类别的占比（统计范围同上）。
molecular_cellular：该文献的MeSH术语中，归属于“分子/细胞生物学”类别的占比（统计范围同上）。
x_coord：该文献在生物医学三角可视化图中的X轴坐标。
y_coord：该文献在生物医学三角可视化图中的Y轴坐标。
is_clinical：布尔标识，用于指示该文献符合临床文章的定义。
cited_by_clin：引用该文献的临床文献的PubMed标识符（PMID）列表。
apt：近似转化潜力（Approximate Potential to Translate），是基于机器学习估算的该文献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 Biology》2019年;17(10):e3000416的研究。
cited_by：引用该文献的所有文献的PMID列表。
references：该文献参考文献列表中收录的文献的PMID列表。

本次提供的大型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命令行工具版本更新。此类压缩文件需使用支持zip 4.5及以上版本的解压工具（如7zip）进行解压。
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