we build a synthetic notability index using five dimensions to figure out a ranking for this broader set of individuals. These dimensions are:
1. the number of Wikipedia editions of each individual; [i.e. number of languages in which this person has a Wikipedia article]
2. the length, i.e total number of words found in all available biographies. […]
3. the average number of biography views (hits) for each individual between 2015 and 2018 in all available language editions […]
4. the number of non-missing items retrieved from Wikipedia or Wikidata for birth date, gender and domain of influence. The intuition here is that the more notable the individual, the more documented his/her biographies will be; [!]
5. the total number of external links (sources, references, etc.) from Wikidata.
We then determine the quantile values from each dimension and add them all to define our notability measure
They also have a table of what this metric throws up as the most "notable" from each time period: https://www.nature.com/articles/s41597-022-01369-4/tables/3 and how the "domain" varies over time: https://www.nature.com/articles/s41597-022-01369-4/figures/2 (note Nobility and Religious in 500–1000, to Sports and Culture post 1950).