For students
whose math skills lag expectations, public schools often increase the fraction
of the school day spent on math instruction. Studying middle-school students
and using regression discontinuity methods, this paper (http://cepa.stanford.edu/sites/default/files/E%20Taylor%2C%20More%20Math%20Class.pdf)
estimates the causal effect of requiring two math classes—one remedial, one
regular—instead of just one class. Math achievement grows much faster under the
requirement, 0.16-0.18 student standard deviations.

## Wednesday, July 23, 2014

### An extra daily math class has little long term benefit

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