Macro-indicators of citation impacts of six prolific countries: InCites data and the statistical significance of trends.

Macro-indicators of citation impacts of six prolific countries: InCites data and the statistical significance of trends.
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DOI:
10.1371/journal.pone.0056768
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Leydesdorff L
Leydesdorff L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bornmann L;Leydesdorff L

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使用汤森路透的Incites工具,这项研究比较了中国、日本、法国、德国、美国和英国在1981年至2010年期间计算的归一化引文影响值。INSTITES提供了一个独特的机会,利用(1)长时间出版窗口(1981年至2010年),(2)区分(广义或狭义的)主题领域,(3)使用统计程序,对各国多年来的引文趋势进行深入的调查,从而研究各国引文的标准化影响。使用四个大类,我们的结果显示,在过去30年中,法国、英国,特别是德国在所有地区的引文影响值都有显著增加的趋势。中国论文的引文影响力仍处于较低水平(大多低于世界平均水平),但全国呈上升趋势。美国多年来呈现出一种稳定的高引文影响值模式。由于出版年份之间的影响差异很小,美国在工程和技术方面的趋势是增加的,但在医学和健康科学以及农业科学方面是减少的。与美国类似,日本在不同的学科领域也遵循着增加和减少的趋势,但不同年份的变化很小。在大多数情况下,来自日本的论文在每个主题领域的表现都低于或接近世界平均水平。
Using the InCites tool of Thomson Reuters, this study compares normalized citation impact values calculated for China, Japan, France, Germany, United States, and the UK throughout the time period from 1981 to 2010. InCites offers a unique opportunity to study the normalized citation impacts of countries using (i) a long publication window (1981 to 2010), (ii) a differentiation in (broad or more narrow) subject areas, and (iii) allowing for the use of statistical procedures in order to obtain an insightful investigation of national citation trends across the years. Using four broad categories, our results show significantly increasing trends in citation impact values for France, the UK, and especially Germany across the last thirty years in all areas. The citation impact of papers from China is still at a relatively low level (mostly below the world average), but the country follows an increasing trend line. The USA exhibits a stable pattern of high citation impact values across the years. With small impact differences between the publication years, the US trend is increasing in engineering and technology but decreasing in medical and health sciences as well as in agricultural sciences. Similar to the USA, Japan follows increasing as well as decreasing trends in different subject areas, but the variability across the years is small. In most of the years, papers from Japan perform below or approximately at the world average in each subject area.
DOI: 10.1002/asi.21534
发表时间: 2011-07-01
影响因子: --
作者:
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通讯作者: Opthof, Tobias
DOI: 10.1007/s11192-008-1830-4
发表时间: 2009-01-01
期刊: SCIENTOMETRICS
影响因子: 3.9
作者:
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影响因子: 3.7
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发表时间: 2009-02-01
影响因子: 5.7
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DOI: 10.1007/s11192-006-0127-8
发表时间: 2006-12-01
期刊: SCIENTOMETRICS
影响因子: 3.9
作者:
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