2001 年至 2010 年发表在影像学文献中的科学论文被引频次的分布：不平等和极化程度的降低。

Distribution of Citations Received by Scientific Papers Published in the Imaging Literature From 2001 to 2010: Decreasing Inequality and Polarization.

机构信息

1 All authors: Department of Radiology, Kangdong Seong-Sim Hospital, Hallym University College of Medicine, 150, Seongan-ro Gangdong-Gu, Seoul 134-701, Korea.

出版信息

AJR Am J Roentgenol. 2017 Aug;209(2):248-254. doi: 10.2214/AJR.16.17769.

DOI:10.2214/AJR.16.17769

PMID:28731807

Abstract

OBJECTIVE

The objective of this study was to assess the distribution of citations received by scientific papers published in the imaging literature between 2001 and 2010.

MATERIALS AND METHODS

We extracted the number of citations of all articles and reviews for 5 years after publication using the Scopus (Elsevier) citation database of imaging journals between 2001 and 2010. We quantitatively analyzed article and review citations from each journal and each year, including the number, proportion, and annual number of citations of the most- (≥ 20 citations) and least-cited (three or fewer citations) papers; ratio of most-cited to least-cited papers; 75/25 percentile citation ratio; 90/10 percentile citation ratio; Gini coefficient; and Kolkata index.

RESULTS

Our analysis of 124,331 articles and 13,575 reviews from 121 journals showed that the proportion of most-cited articles (from 19.6% to 27.1%) and reviews (from 19.1% to 37.2%) increased from 2001 to 2010, whereas the proportion of least-cited articles (from 32.3% to 23.0%) and reviews (from 31.9% to 15.8%) declined over the same period. The annual numbers of citations of most-cited articles and reviews both reached a peak in the fourth year after publication, whereas those of least-cited articles and reviews reached a peak in the second and fist years, respectively, after publication and thereafter decreased. The 75/25 percentile ratio for articles declined from 41.1 to 27.5 between 2001 and 2010. Over the same time, the 75/25 percentile ratio for reviews declined from 47.4 to 22.9. The 90/10 percentile ratio for articles declined from 1730.8 to 188.7; for reviews, the 90/10 percentile ratio declined from 5788.0 to 100.7. The Gini coefficient of articles and reviews also declined from 0.6116 to 0.5721 for articles and from 0.6507 to 0.5649 for reviews; the k index, from 0.7260 to 0.7088 for articles from 0.7409 to 0.7072 for reviews.

CONCLUSION

Inequality and polarization of citations consistently decreased in the imaging literature from 2001 to 2010.

摘要

目的

本研究旨在评估 2001 年至 2010 年间影像学文献中发表的科学论文的引文分布情况。

材料和方法

我们使用 2001 年至 2010 年间的 Scopus（爱思唯尔）影像学期刊引文数据库，提取了所有文章和综述发表后 5 年的引文数量。我们定量分析了每个期刊和每年的文章和综述的引文数量，包括最多引用（≥ 20 次）和最少引用（三次或更少）论文的数量、比例和年引文数；最多引用论文与最少引用论文的比例；75/25 分位数引文比；90/10 分位数引文比；基尼系数；和加尔各答指数。

结果

我们对 121 种期刊的 124331 篇文章和 13575 篇综述进行了分析，结果显示，从 2001 年到 2010 年，最多引用论文（19.6% 至 27.1%）和综述（19.1% 至 37.2%）的比例增加，而最少引用论文（32.3% 至 23.0%）和综述（31.9% 至 15.8%）的比例下降。最多引用论文和综述的年引文数量均在发表后第四年达到峰值，而最少引用论文和综述的年引文数量分别在发表后第二年和第一年达到峰值，此后呈下降趋势。2001 年至 2010 年间，文章的 75/25 分位数比从 41.1 降至 27.5。同期，综述的 75/25 分位数比从 47.4 降至 22.9。文章的 90/10 分位数比从 1730.8 降至 188.7；综述的 90/10 分位数比从 5788.0 降至 100.7。文章和综述的基尼系数也从 0.6116 降至 0.5721，从 0.6507 降至 0.5649；k 指数从 0.7260 降至 0.7088，从 0.7409 降至 0.7072。