Christmas cheer raises test scores, concludes Brookings’ Matthew Chingos.
He crunches PISA data to show that scores are higher in countries where Christmas is a public holiday. (First step: Exclude Shanghai.)
That’s confirmed by NAEP scores on fourth-grade math performance from 1990 to 2013, which show test scores rise and fall with holiday cheer (measured by consumer spending in November and December).
Standardizing the NAEP scores and putting the spending index on a logarithmic scale implies that if we could just have about 30% more holiday spirit, our students would do as well as those in Finland!
Brilliant, writes Jay Greene. And the reason why “random-assignment and other research designs that more strongly identify causation are so important.”