I want to know if there is an impact factor of a journal on research gate = 2.5 , but on SJR - scimago journal ranking = 0.5, so actual impact ?

so what is the actual impact factor  for that journal? is there a universal agency or guideline for calculating the impact factor, I Know it works on citations and access rate.... but then , many...

04 April 2015 8,547 4 View