Bitmap Bitmap the impact factor of bioanalysis journal is a measure reflecting the average number of citations to recent articles published in the journal. it is intermittently used as a proxy for the relative importance of a journal within its field, with journals with higher impact factors deemed to be more important than those with lower ones. the impact factor was arrange by eugene garfield, the founder of the institute for scientific information bioanalysis impact factors are calculated yearly starting from 2013 for those journals that are indexed in the journal citation reports. a journal can approve editorial policies to advance its impact factor. for example, journals may publish a bigger percentage of review articles which generally are cited more than research reports. thus review articles can increment the impact factor of the journal and review journals will therefore often have the highest impact factors in their respective fields. some journal editors set their capitulation policy to "by invitation only" to appeal toexclusively senior scientists to publish "citable" papers to increase the journal impact factor. journals may also experiment to limit the number of "citable items"