* * Dougherty, Introduction to Econometrics, 4th ed * Example from Section 14.1 * Panel data * open data nlsy2000c.xls data(format=xls,org=columns,missing=-999999.0) 1 42815 time id age sm sf siblings ethblack ethhisp asvab02 asvab03 asvab04 $ height85 weight youngch exper expsq classpri classgov classse earnings hours tenure tenuresq uncolb union $ regne regnc regw regs soonmarr single married s urban male asvabc agesq * set lgearn = log(earnings) * linreg(smpl=male.and.time==8) lgearn # constant married soonmarr s asvabc tenure tenuresq exper expsq age agesq ethblack ethhisp regne regnc regw urban linreg(smpl=male.and.time==8) lgearn # constant single soonmarr s asvabc tenure tenuresq exper expsq age agesq ethblack ethhisp regne regnc regw urban