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Phylogenetics Impact-factor

 Phylogenetics journal's impact factor is a metric that represents the total number of citations to recent articles published in the journal. It is also used as a metric for a journal's relative significance within its region, with journals with higher impact factors considered more important than those with lower ones. The impact factor was devised by the Institute for Scientific Information founder, Eugene Garfield. To increase its impact factor a journal can adopt editorial policies. For instance, Phylogenetics journals can publish a greater percentage of review articles that are generally cited more than research reports. Review articles can therefore raise the journal's impact factor and therefore review journals will often have the highest impact factors in their respective fields. Some journal editors set their submission policy by invitation only to invite senior scientists exclusively to publish citable papers to increase the impact factor for the journal. Journals may also attempt to limit the number of citable items, i.e., the impact factor equation denominator, either by refusing to publish articles which are unlikely to be cited or by altering articles in the hope that Thomson Scientific will not consider it a "citable item." The impact factor variations of more than 300 per cent were observed as a result of negotiations on whether items are "citable." Interestingly, things deemed uncitable and thus not included in the estimation of the impact factor that, if quoted, still enter the numerator portion of the equation given the ease with which such quotations may be removed. This influence is difficult to measure, because the difference between editorial commentary and brief original articles is not always evident. The letters to the editor, for example, can refer to either class.