* Reference: Chapter 10 of * Jeffrey M. Wooldridge, Introductory Econometrics: A Modern Approach, * South-Western College Publishing, 2000. SAMPLE 1 49 READ (INTDEF.shd) year i3 inf rec out def i3_1 inf_1 def_1 & ci3 cinf cdef y77 SET MISSVALU=-999 SET SKIPMISS * Example 10.2 * Equation (10.15), p. 324. OLS i3 inf def STOP