Department of Neurosurgery, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212, USA.
J Neurosurg. 2010 Nov;113(5):929-33. doi: 10.3171/2010.4.JNS091842. Epub 2010 May 14.
The h index is a recently developed bibliometric that assesses an investigator's scientific impact with a single number. It has rapidly gained popularity in the physical and, more recently, medical sciences.
The h index for all 1120 academic neurosurgeons working at all Electronic Residency Application Service-listed training programs was determined by reference to Google Scholar. A random subset of 100 individuals was investigated in PubMed to determine the total number of publications produced.
The median h index was 9 (range 0-68), with the 75th, 90th, and 95th percentiles being 17, 26, and 36, respectively. The h indices increased significantly with increasing academic rank, with the median for instructors, assistant professors, associate professors, and professors being 2, 5, 10, and 19, respectively (p < 0.0001, Kruskal-Wallis; all groups significantly different from each other except the difference between instructor and assistant professor [Conover]). Departmental chairs had a median h index of 22 (range 3-55) and program directors a median of 17 (range 0-62). Plot of the log of the rank versus h index demonstrated a remarkable linear pattern (R(2) = 0.995, p < 0.0001), suggesting that this is a power-law relationship.
A survey of the h index for all of academic neurosurgery is presented. Results can be used for benchmark purposes. The distribution of the h index within an academic population is described for the first time and appears related to the ubiquitous power-law distribution.
h 指数是一种新的文献计量学指标，用于评估研究人员的科学影响力，用一个单一的数字来表示。它在物理学领域迅速流行起来，最近在医学领域也得到了广泛应用。
通过参考 Google Scholar，确定了在所有参加电子住院医师申请服务（Electronic Residency Application Service）列出的培训计划的 1120 名学术神经外科医生的 h 指数。在 PubMed 中调查了 100 名随机个体，以确定他们总共发表的论文数量。
中位数 h 指数为 9（范围 0-68），75%、90%和 95%的分位数分别为 17、26 和 36。h 指数随着学术职称的增加而显著增加，讲师、助理教授、副教授和教授的中位数 h 指数分别为 2、5、10 和 19（p < 0.0001，Kruskal-Wallis；所有组之间均有显著差异，除了讲师和助理教授之间的差异[Conover]除外）。系主任的 h 指数中位数为 22（范围 3-55），项目主任的 h 指数中位数为 17（范围 0-62）。对数秩与 h 指数的图显示出显著的线性模式（R²=0.995，p < 0.0001），表明这是一种幂律关系。
本文呈现了对所有学术神经外科学者的 h 指数的调查结果。这些结果可用于基准目的。首次描述了 h 指数在学术人群中的分布情况，并且它似乎与普遍存在的幂律分布有关。
