I will quite honest and say that beyond the fact of knowing that Ranged Critical hit's damage increase is less than Melee damage increase, I dont really know anything else on how exactly it is calculated. The wiki has this article:
http://wiki.ffxiclopedia.org/wiki/Le...ction_and_pDIF
However, I would greatly appreciate it if someone could explain it in a less technical manner since I am having trouble understading it.
XI Wiki

