There are two variables about graduate students’ time use: hrschool = average number of hours spent on school each week and hrjob = average number of hours spent on their jobs each week. (These two variables do not overlap and there are no missing data.)  You want to create a new variable hschjob, which:

= 1 if the number of hours for school and for the job are each less than or equal to 20 hours per week, 

= 2 if school is more than 20 hours but the job is 20 or less,

= 3 if school is 20 or less, but the job is over 20, and 

= 4 if both school and job are each more than 20 hours per week.  

Write Stata code to create hrschjob