TY - JOUR TI - Enhanced Routines for Instrumental Variables/Generalized Method of Moments Estimation and Testing AU - Christopher F. Baum AU - Mark E. Schaffer AU - Steven Stillman JO - The Stata Journal Promoting communications on statistics and Stata PY - 2007 VL - 7 IS - 4 DO - 10.1177/1536867x0800700402 UR - https://doi.org/10.1177/1536867x0800700402 ER -