[MattSteelblade]

The author posted a link to an article[1] showing that Mississippi's retention policies were not responsible for the increase in scores.

> But I've gotten some plausible pushback from researchers who say that Mississippi has always held back lots of kids. In practice, the 2013 law didn't change anything.

> ...

> In 2017, the average age of a fourth grade class is a minuscule 0.01 higher than the 1998-2013 average. That's no difference at all. This proxy is strong evidence that Mississippi's retention policies never changed in practice, which means it's entirely kosher to just compare their scores normally before and after reform.

[1] https://jabberwocking.com/mississippi-revisited-the-mississi...