* Reference: Chapter 13 of * R. Carter Hill, William E. Griffiths and George G. Judge, * Undergraduate Econometrics, Second Edition, Wiley. READ (TAB13-2.shd) / NAMES STAT / ALL * Instrumental variables estimation, Table 13.4, p. 296 2SLS Y X (Z) * Hausman test, Chapter 13.4 OLS X Z / RESID=VHAT * Table 13.5, p. 300 OLS Y X VHAT STOP