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X 1 - one quantitative independent variables X 2 and X 3 - two dummy variables used to describe a qualitative variable with 3 levels X 4 - a dummy

  • X1 - one quantitative independent variables
  • X2 and X3 - two dummy variables used to describe a qualitative variable with 3 levels
  • X4 - a dummy variable used to describe a qualitative variable with 2 levels.

 

how would I go about building the 2nd order model?

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