Other recent applications of quantile regressions that use a similar dummy variable structure to capture an individual’s education level include Budria and Pereira (2005), Budria and Moro-Egido (2008) and Prieto-Rodriguez et al. ( The results are robust to the addition of a dummy variable for having a post-secondary non-tertiary degree and a dummy variable for having a PhD degree (for those countries for which this information is available). Adding these variables to the baseline specification hardly alters the results obtained for the baseline variables.