In model 1, all variables are statistically significant at 1%. IQ by 6.856541 coef shows if IQ increased by 1, then their salaries will increase 6.856541USD. KWW and are correlated with IQ educ should not be included in the model. If the work experience, the salary increase by 1 year increased 8.307752USD. Compared to single people, married people have higher incomes up to 178.5715USD. These statistics reflect a somewhat racial discrimination against blacks when their salary is lower than the rest up to 115.852USD. Living in urban areas will significantly affect the earnings of an individual living in higher-income urban 185.4682USD. And finally, the level of education of the mother also affects the income of their children. Those whose mothers had higher levels of education than 1 year, higher incomes 17.6049USD
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