Prusssell vs Russell

Is there a difference between the 2 universes? If so, what?

PRussell universes are based on P123’s rules-based recreation of Russell indices. They are not exactly the same. Although Russell indices’ inclusion criteria are more objective than S&P’s, there are some barriers to replication.

Thank you so much, Primus.

Do you know if there is a discussion of the “other factors” besides market cap for the R1000 anywhere?

To add just a little bit more info → https://www.portfolio123.com/mvnforum/viewthread_thread,10518#58111