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The number of Wikipedia editions of each individual;
The length, i.e total number of words found in all available biographies. It is equal to zero for individuals with just one Wikidata entry and no biography in Wikipedia;
The average number of biography views (hits) for each individual between 2015 and 2018 in all available language editions, using an API available in https://wikitech.wikimedia.org/wiki/Analytics/AQS/Pageviews or zero in the absence of a Wikipedia biography;
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;
The total number of external links (sources, references, etc.) from Wikidata.
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