This is all not new and relates to fundamental ideas of #sampling in #Statistics, #Epidemiology, and #Norming in psychometric applications.
In this educational piece I co-wrote with Edwin de Beurs and @admin we refer to many of these principles and the importance of the sampling process -- and more importantly, many of the older references we pulled together are good places do start reading up on the historical treatment of this topic:
https://onlinelibrary.wiley.com/doi/10.1002/cpp.2742
The introduction to Chapter 2 (reliability/precision) acknowledges that the sampling process can lead to significant differences in the determined coefficients,
that they therefore [2014, p. 37] "should be estimated separately for all relevant subgroups"
and that this is also important to assess potential consequences for #TestFairness.
And in Chapter 5 focuses especially in the discussion of #Norming of #TestScores on such aspects, including relating to our previous discussion...
#NFL #Race #Norming #CTE #Black
Begun in the 1990's by the same league that has been majority Black in terms of players, yet to this day finds it nearly impossible to hire Black head coaches "The NFL...pledged to halt the use of 'race-norming' — which assumed Black players started out with lower cognitive function".
The National Football League hates the majority of its players and a significant portion of its fanbase.
But enjoy making rich white racist men richer!