Using survey-to-survey imputation to fill poverty data gaps at low cost : evidence from a randomized survey experiment / Hai-Anh Dang (World Bank, IZA, Indiana University and LSE), Talip Kilic (World Bank), Vladimir Hlasny (UN ESCWA), Kseniya Abanokova (World Bank), Calogero Carletto (World Bank) ; IZA Institute of Labor Economics