caa a22 4500 445348127 CHVBK 20180317142835.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s11192-010-0334-1 doi (NATIONALLICENCE)springer-10.1007/s11192-010-0334-1 Campanario Juan Departamento de Física, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain aut Empirical study of journal impact factors obtained using the classical two-year citation window versus a five-year citation window [Elektronische Daten] [Juan Campanario] In this article I study characteristics of the journal impact factor (JIF) computed using a 5-year citation window as compared with the classical JIF computed using a 2-year citation window. Since 2007 ISI-Thomson Reuters has published the new 5-year impact factor in the JCR database. I studied changes in the distribution of JIFs when the citation window was enlarged. The distributions of journals according their 5-year JIFs were very similar all years studied, and were also similar to the distribution according to the 2-year JIFs. In about 72% of journals, the JIF increased when the longer citation window was used. Plots of 5-year JIFs against rank closely followed a beta function with two exponents. Thus, the 5-year JIF seems to behave very similarly to the 2-year JIF. The results also suggest that gains in JIF with the longer citation window tend to distribute similarly in all years. Changes in these gains also tend to distribute similarly from 1year to the following year. Akadémiai Kiadó, Budapest, Hungary, 2010 Journal impact factor nationallicence Citation window nationallicence Scientometrics Springer Netherlands 87/1(2011-04-01), 189-204 0138-9130 87:1<189 2011 87 11192 https://doi.org/10.1007/s11192-010-0334-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11192-010-0334-1 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Campanario Juan Departamento de Física, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain aut NATIONALLICENCE 773 0- Scientometrics Springer Netherlands 87/1(2011-04-01), 189-204 0138-9130 87:1<189 2011 87 11192 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer