“…To address this concern, we also use the Recentered Influence Function (RIF) method recently developed by Firpo et al (2009), which explicitly relaxes the common distribution assumption. 2 More specifically, when the observed outcomes (in this case, test scores) vary monotonically with the unobserved variable (in this case, student preparation), RIF for the τ th quantile as: For our analysis, instead of examining students at the same quantile across states and years (as in the QDiD case), the RIF method compares students with the same test score and hence located at potentially different quantiles of the distributions across states 2 Given its flexibility, the RIF method has recently been applied to analyze a range of issues such as cigarette taxes (Maclean et al, 2014) and child care (Havnes and Mogstad, 2015).…”