The first group of variables contains a number of characteristics such as gender, year of birth, or parents’ educational achievements that are fixed in the sense that they can not have changed over an employee’s working life.
exploredata-ZA3700_VarV320 exploredata-ZA3700_VarV184 exploredata-ZA3700_VarV318 exploredata-ZA3700_VarV182 exploredata-ZA3700_VarV545