Gibbons, Steve; Telhaj, Shqiponja - Centre for the Economics of Education, LSE - 2007
schools. We find that immobile pupils in year-groups (à la US "grades") that experience high pupil entry rates progress less …. An increase in annual entry rates from 0 to 10% (a 4 standard deviation change) would set the average incumbent pupil … back by between 1 and 2 weeks, or about 4% of one standard deviation of the gain in pupil achievement between ages 7 and 11. …