So according to that ranking, a company with 80/20 female-to-male ratio is much more diverse than a one with 20/80 ratio. I don't think that "diversity" is the correct term for what they're measuring.
Diversity certainly isn't the only term--the other is inclusion. We stand by some of these female heavy companies that are inclusive of underrepresented groups in tech. That's the difference between 80/20 and 20/80.
Our ranking weighs gender and race-based diversity across all types of roles, as well as a score calculated from the Simpson’s Diversity Index. With Simpson's, diversity goes up as a result of an increase in demographic richness and evenness, commonly used in university admissions. It's one of several variables used in the ranking, and probably speaks a little more directly to the way in which you're interpreting diversity.
Our ranking weighs gender and race-based diversity across all types of roles, as well as a score calculated from the Simpson’s Diversity Index. With Simpson's, diversity goes up as a result of an increase in demographic richness and evenness, commonly used in university admissions. It's one of several variables used in the ranking, and probably speaks a little more directly to the way in which you're interpreting diversity.