In this paper, we evaluate the effect of the literacy hour in English primary schools on pupil attainment. The National Literacy Project (NLP) was undertaken in about 400 English primary schools in 1997 and 1998. We compare the reading and overall English attainment of children in NLP schools as...

Social experiments are powerful sources of information about the effectiveness of interventions. In practice, initial randomization plans are almost always compromised. Multiple hypotheses are frequently tested. "Significant" effects are often reported with p-values that do not account for...