“...In any study with voluntary participation, self-selection risks leading to invalid conclusions. If the determinants of selection are observed, it is however...”

“...We use the Swedish compulsory school reform to estimate the causal effect of parental education on sons 1 outcomes. To this end, we use data from the Swedish...”

“...When analyzing effect heterogeneity, the researcher commonly opts for stratification or a regression model with interactions. While these methods provide...”