14 Selection Bias – Pitt & Khandker Until today, most rigorous attempt at controlling for selection bias Quasi-experiment & eligibility requirements used to measure programme impact Primary eligibility criterion: landownership Treatment Village Control Village Overall findings: microcredit has positive impacts BUT: accuracy of results disputed due to lax enforcement of eligibility criteria Econometric debate between Pitt & Khandker and Morduch, not resolved until today Eligible but do not participate Participants Not eligible Would be eligible Would not be eligible Source: Armendáriz de Aghion and Morduch, 2005.
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