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Table 2 Algorithm of citations-over-age index determination in either PubMed Central or Google™ Scholar mode

From: PubFocus: semantic MEDLINE/PubMed citations analytics through integration of controlled biomedical dictionaries and ranking algorithm

   Age
   < = 1 year >1 and < = 3 years > 3 and < = 5 years > 5 years
Forward Citations No forward citations 1 1 0.75 0.5
  Present forward citations 1+(0.4*n) 1+(0.2*n) 1+(0.1*n) 1+(0.1*n)
  1. where n = number of forward citations