Attanasio Selection-Bias Decomposition Framework
Virtual-Within interaction yields a statistically significant intensive quality increase among motivated Milestone 0 completers ($\beta = 0.138, p < 0.05$ in Large-Country Sample; $\beta = 0.427, p < 0.05$ in Uganda Sample). Under the BAS assumption, this observed conditional effect serves as a strict lower bound for the true unconditional quality impact.