I didn’t see anything about this in the article, so I ask here in the hopes that someone more knowledgeable can comment: how are they controlling for selection bias? Is there any way to select into or out of this school, or is it purely the standard districting system? Even if it’s the latter in many other places it’s still possible to move into the area. Do we know to what extent that has been happening?
Edit: Oops, I was tricked by an advert. The article continued to say that the students were admitted by lottery. The only question I’m immediately left with then is whether they had to enter the lottery, or whether it was automatic? And was their admission contingent on their parents’ willingness to participate in these extra classes?
Edit: Oops, I was tricked by an advert. The article continued to say that the students were admitted by lottery. The only question I’m immediately left with then is whether they had to enter the lottery, or whether it was automatic? And was their admission contingent on their parents’ willingness to participate in these extra classes?
https://fredrikdeboer.com/2017/03/29/why-selection-bias-is-t...