check your searching engine
looking at Poland: only 10 Physical Review A in the period listed?? Of course wrong - here come 3 my own papers not found: http://journals.aps.org/pra/abstract/10.1103/PhysRevA.89.033625
why show statistics which obviosly does not work?
it is even worse with institutions...
Those articles are not included in the Index dataset. I’d suggest checking the FAQ page (http://www.natureindex.com/faq#methodology5), only ‘Highlighted articles’ and ‘Rapid Communications’ from Physical Review A, Physical Review B and Physical Review D are included in the dataset.
What issues did you find with the institutions?
I will take a look at them for you.
Thank you for your interest in the Index.