* Reference: Chapters 3 and 7 of * Jeffrey M. Wooldridge, Introductory Econometrics: A Modern Approach, * South-Western College Publishing, 2000. SAMPLE 1 706 READ (SLEEP75.shd) age black case clerical construc educ earns74 & gdhlth inlf leis1 leis2 leis3 smsa lhrwage lothinc male & marr prot rlxall selfe sleep slpnaps south spsepay spwrk75 & totwrk union worknrm workscnd exper yngkid yrsmarr hrwage agesq SET MISSVALU=-999 SET SKIPMISS * Problem 3.3, p. 104. OLS sleep totwrk educ age * Problem 7.1, p. 241. OLS sleep totwrk educ age agesq male STOP