Before revision:  Results show an increase of 0.028 standard deviations in test grades, one year after the opening , and are robust to a series of potential problems, including some of the usual concerns in event study models.
After revision:  Results show an average increase of 0.038 standard deviations in test grades, one year after the opening , and are robust to a series of potential problems, including some of the usual concerns in event study models.