1. Horseshoes, hand grenades, and treatment effects? Reassessing whether nonexperimental estimators are biased. (February 2015) Authors: Fortson, Kenneth; Gleason, Philip; Kopa, Emma; Verbitsky-Savitz, Natalya Journal: Economics of education review Issue: Volume 44(2015:Feb.) Page Start: 100 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗