Nonparametric instrumental variable methods for dynamic treatment evaluation / Gerard J. van den Berg (University of Bristol, IFAU-Uppsala, IZA, ZEW), Petyo Bonev (MINES ParisTech, PSL Research University, CERNA, i3), Enno Mammen (Heidelberg University, National Research University Higher School of Economics) ; IZA. Bonn : IZA, February 2016