[blintz]

> This page measures the concentration of the Fediverse and the Atmosphere according to the Herfindahl–Hirschman Index (HHI), an indicator from economics used to measure competition between firms in an industry. Mathematically, HHI is the sum of the squares of market shares of all servers.

I had not heard of this metric before - it’s neat and simple to understand. If you scaled it down to 0-100 (by dividing by 100), I think it would make the numbers more immediately understandable. I’d even consider inverting it (so 0 = centralized and 100 = decentralized), since the website title implies measuring progress ‘towards’ decentralization.

[baq]

OTOH the reason why they didn't normalize to 100 may be to not give people an idea that the measure is linear; seeing a score of 2500 makes you ask 'what does it mean?' whereas if you were presented with 25/100 you probably wouldn't think that it is 'highly concentrated'.