To date, there has not been any definitive statement for bibliometric analyses from the scientific community as to how long to make the period for analysis in order to guarantee the maximum possible validity of citation analyses. Up to now, it has been particularly unclear as to whether different disciplines and citation indicators have any effect on what period for analysis to select. This is why this study aims to provide answers to these issues. Therefore, publications in the fields of business studies, biology, and medicine from 2007 to 2009 are surveyed. The citations from ten separate consecutive citation periods from 2009 up to 2018 are generated for these publications from Web of Science and selected citation indicators are calculated for them. The results show that the fundamental validity of citation indicators increases with time. However, if the goal of the analyses is to establish a ranking order, then even short citation periods are informative. Our results are stable in terms of the disciplines, although differences do occur in the citation indicators under consideration.

中文翻译：

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引用期是否对研究评估中所选引用指标的信息价值有任何影响？

迄今为止，科学界还没有关于文献计量分析需要多长时间进行分析以保证引文分析的最大可能有效性的明确声明。到目前为止，对于不同的学科和引文指标是否对选择哪个时期进行分析有什么影响，一直特别不清楚。这就是为什么本研究旨在为这些问题提供答案。因此，调查了 2007 年至 2009 年商业研究、生物学和医学领域的出版物。这些出版物从 2009 年到 2018 年的十个独立的连续引用期间的引用是从 Web of Science 生成的，并为它们计算选定的引用指标。结果表明，引文指标的基本效度随时间增加。然而，如果分析的目标是建立一个排名顺序，那么即使很短的引用期也能提供信息。我们的结果在学科方面是稳定的，尽管所考虑的引文指标确实存在差异。