The eleventh variable is log(wage) and the 10 other variables are actually
all at least theorically significant to the regression. like wether the
person is black, immmigrant, it´s experience, age, if he works in a city...
But i need only take a few variables out of this ten. Actually taking only
experience experience² and education level is enough to make the regression
significate. But i need some control parmeters added. I don´t want to choose
all of them so I am trying to see which gives me an esthetic result. 

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