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Is there a possible confounder that the kids whose parents find out about these offerings and take their kids to them are more attentive overall?
by spoonjim 6y ago
Is there a possible confounder that the kids whose parents find out about these offerings and take their kids to them are more attentive overall?
- mlyle 6y agoThere's always confounders like this. Well designed studies find ways to exploit the enrollment structures. E.g. you let a randomized group of n kids on the wait list who wouldn't end up with services jump the wait list and compare them to n kids stuck on the wait list. Or you randomize half the kids you help to half-day and the other half to full day. What you describe shows up in "benefits" of various charter school structures. The charter school kids do better than the kids in comparison schools... but if you compare the charter school kids who won the enrollment lottery to those not offered admission, they usually don't look better.
- eru 6y agoSometimes they do, it depends.