I understand how that works but we're going to need to draw a line somewhere. Going by job, rank, and salary alone could ignore hours worked per week (statistically men tend to do more in the same role), bonuses for high quality work (who knows how this plays out?), etc. I could choose whatever filters I want to frame the data how I want it to, it's one of the biggest tricks of the "women are paid X less than men" camp.