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Source Normalized Impact per Paper(SNIP),2010年由荷兰莱顿大学教授Henk F.Moed提出,旨在对期刊进行跨学科比较。SNIP同时考虑到引文和被引两方面的影响,将数据库的文献覆盖率计入考虑,通过严密的学科标准化算法使其成为一种专业性强、计量稳定、学科规划细致的评价指标。2010年Scopus数据库推出SNIP后引发对学科标准化的广泛讨论,2012年莱顿大学的Ludo Waltman提出SNIP的修正算法SNIP2,对标准化、引文统计等做出修正。本文对SNIP的计量方式及其2012年发布的修正算法SNIP2进行了详细的论述。
Source Normalized Impact per Paper (SNIP), presented by Henk F. Moed, a professor at the University of Leiden in 2010, aims to make interdisciplinary comparisons of journals. Taking into account both the citation and the cited citation, the SNIP takes into account the document coverage of the database and makes it a highly specialized, stable measurement and disciplined evaluation indicator through rigorous disciplinary standardization algorithms. The introduction of the SNIP in the Scopus database in 2010 led to a widespread discussion of disciplinary standardization. Ludo Waltman of Leiden University in 2012 proposed the SNIP2 algorithm for SNIP revision, amending the standardization and citation statistics. This text has carried on the elaboration to SNIP measurement way and its revision algorithm SNIP2 that released in 2012.