What does the Web of Science fi ve-year synchronous impact factor have to offer?

• 作者: Ronald Rousseau
• 来源期刊: 中国文献情报：英文版
• 学科: 社会科学
• 关键词: SYNCHRONOUS impact factor Wilcoxon matched-pairs S
• 年，卷（期）: 2009,（3）
• 页码范围: 1-7
• 页数: 7页
• 分类号: G353.1

摘要

With a random sample of 10 JCR(Science)subject areas it is shown that the2-year and the 5-year impact factor of journals lead statistically to the same ranking per category.Yet in a majority of cases,the 5-year impact factor is larger than the 2-year one.