Education London School of Economics Houghton Street London WC2A 2AE ©Andreas Ammermueller and Jörn-Steffen Pischke … up other omitted characteristics of the school or class room, a problem commonly referred to as correlated effects. For … peer groups across classes within a particular school. We argue that classes within primary schools are formed roughly …

detailed information on the early school career of a large representative sample of pupils. This dataset makes it possible to … school, the heavy teaching load, and the very high propor- tion of pupils who have to repeat one or two grades before the end … information on the early school career of a representative sample of pupils who started primary school in 1997. The basic sampling …