A New Strategy for Reducing Selection Bias in Nonexperimental Evaluations, and the Case of How Public Assistance Receipt Affects Charitable Giving
Laura R. Peck, Ida D’Attoma, Furio Camillo and Chao Guo
http://onlinelibrary.wiley.com/doi/10.1111/j.1541-0072.2012.00466.x/abstract