Large increases and decreases in journal impact factors in only one year: The effect of journal self-citations

I studied the factors (citations, self-citations, and number of articles) that influenced large changes in only 1 year in the impact factors (IFs) of journals. A set of 360 instances of journals with large increases or decreases in their IFs from a given year to the following was selected from journals in the Journal Citation Reports from 1998 to 2007 (40 journals each year). The main factor influencing large changes was the change in the number of citations. About 54% of the increases and 42% of the decreases in the journal IFs were associated with changes in the journal self-citations. © 2011 Wiley Periodicals, Inc.

[1]  Juan Miguel Campanario,et al.  Journal self-citations that contribute to the impact factor: Documents labeled “editorial material” in journals covered by the Science Citation Index , 2006, Scientometrics.

[2]  Vincent Larivière,et al.  History of the journal impact factor: Contingencies and consequences , 2009, Scientometrics.

[3]  David T. Yew.  New Impact Factors Yield Surprises , 2010 .

[4]  Germinal Cocho,et al.  On the behavior of journal impact factor rank-order distribution , 2006, J. Informetrics.

[5]  Juan Miguel Campanario,et al.  Structure of the impact factor of journals included in the Social Sciences Citation Index: Citations from documents labeled "editorial material" , 2007, J. Assoc. Inf. Sci. Technol..

[6]  Henk F. Moed,et al.  Journal impact measures in bibliometric research , 2004, Scientometrics.

[7]  Guang Yu,et al.  The self-cited rate of scientific journals and the manipulation of their impact factors , 2007, Scientometrics.

[8]  Juan Miguel Campanario,et al.  Surviving bad times: The role of citations, self-citations and numbers of citable items in recovery of the journal impact factor after at least four years of continuous decreases , 2009, Scientometrics.

[9]  P. V. van Diest,et al.  Impactitis: new cures for an old disease. , 2001, Journal of clinical pathology.

[10]  Juan Miguel Campanario,et al.  Journals that increase their impact factor at least fourfold in a few years: The role of journal self-citations , 2009, Scientometrics.

[11]  Emma Hill,et al.  Irreproducible Results—a Response to Thomson Scientific , 2008, The Journal of general physiology.

[12]  Richard Smith,et al.  Journal accused of manipulating impact factor , 1997 .

[13]  María Jesús Mancebón-Torrubia,et al.  The evaluation of scientific production: Towards a neutral impact factor , 2009, Scientometrics.

[14]  Juan Miguel Campanario,et al.  Distribution of changes in impact factors over time , 2010, Scientometrics.

[15]  R. Monastersky.  The number that's devouring science , 2005 .

[16]  Guang Yu,et al.  Reliability-based citation impact factor and the manipulation of impact factor , 2010, Scientometrics.

[17]  Juan Miguel Campanario,et al.  La influencia de las autocitas en el aumento del factor de impacto en revistas de Ciencias Sociales , 2010 .

[18]  Emma Hill,et al.  Show me the data. , 1998 .