Achievement test scores not only reflect students’ ability, knowledge and intelligence, but also their noncognitive skills such as personality traits and motivation. If multiple traits determine test scores, an important question is whether it is feasible to unravel the information from one...

Previous findings on (fleeting) relative age effects in school suggest that, given innate ability, too few younger and too many older students attend academic tracks. Using a regression discontinuity design around school-specific admission thresholds, we estimate the cognitive and non-cognitive...