title: How to add control variable in regression using statsmodels and sklearn?
body: <p>I am trying to perform multiple linear regression using statsmodels and sklearn while controlling for covariates like socioeconomic status (age, gender, ethnicities). 
  I have done it in SPSS which is fairly easy, since I can just click on the variables that I would like to control, but I have to switch to python, and don't know if there are any functions that allow me to do this?
  Thanks so much!</p>