* Reference: Chapter 13 of * Jeffrey M. Wooldridge, Introductory Econometrics: A Modern Approach, * South-Western College Publishing, 2000. SAMPLE 1 7150 READ (INJURY.shd) durat afchnge highearn male married ky mi ldurat & afhigh head neck upextr trunk lowback lowextr occdis manuf construc SET MISSVALU=-999 SET SKIPMISS SET NOWARNMISS * Example 13.4, pp. 418-419. * Restrict the sample to Kentucky SET NOWARNSKIP SKIPIF (ky.EQ.0) OLS ldurat afchnge highearn afhigh STOP