clear all // clear the environment/memory set more off sysuse nlsw88 // load the built-in dataset nlsw88 Please make sure your do-file is reasonably documented to help us understand your code. nlsw88 is a built-in dataset that comes with Stata. It is an extract from the 1988 round of the National Longitudinal Survey of Mature and Young Women. Following is a summary of the variables in this dataset. idcode age race married never married grade collgrad south smsa c_city industry occupation union wage hours ttl exp tenure survey id age race, can take three values, white, black or other = 1 if is currently married, = 0 otherwise = 1 if never married, 0 otherwise current grade completed = 1 if graduated from college, = 0 otherwise = 1 if lives in southern states, 0 otherwise = 1 if lives in standard metropolitan statistical area, = 0 otherwise = 1 if lives in central city, = 0 otherwise industry, use tab industry to see the categories occupation, use tab occupation to see the categories = 1 if is in a union, = 0 otherwise hourly wage, measured in $ hours worked per week total work experience, measured in years current job tenure, measured in years More information on the original data can be found here: /**