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Clinical Rehabilitation, Vol. 15, No. 2, 115-118 (2001)
DOI: 10.1191/026921501676657944

Editorial

The ‘impact factor’ – an explanation and its application to rehabilitation journals

Gustaaf J Lankhorst

Vrije Universiteit, Department of Rehabilitation Medicine Amsterdam, The Netherlands

Franco Franchignoni

Fondazione Salvatore Maugeri, Clinica del Lavoro e della Riabilitazione Rehabilitation Institutes of Veruno and Genoa-Nervi, Italy

The impact factor is calculated by dividing the number of times articles from a journal are cited in a core of about 5000 journals by the number of articles published by that journal in the same period of two years. It is used as a measure of a journal's scientific influence, but the assumptions underlying this use are flawed. Although the use of the impact factor is recognized to be invalid, nonetheless it continues, in part because no better agreed measure has yet been developed.


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