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Homework Help: Coding Variables for linear regression

  1. Apr 30, 2013 #1
    1. The problem statement, all variables and given/known data

    I have to design an experiment with 3 factors. One factor has to be quantitative with at least 3 levels. One Qualitative with at least 3 levels. And the last one can be either quant/qual with at least 2 levels.

    My question is in regards to coding the variables. For example, and Im not sure this is correct, one of my quantitative factors is age groups. 10-20,21-30, 31-40,41-50. How would I code this using dummy variables?

    2. Relevant equations

    3. The attempt at a solution

    Since these are age groups it seems that coding my variable using
    x1 x2
    1 1
    0 0
    1 0
    0 1

    with respect to the age groups is more of a qualitative approach.

    What I wish to do is make the coded variable be an interval taking into account a persons age. Not just ok, you are in group 1 because u are 15, but rather, your respective interval is x.

    Sorry I forgot most of my statistics info and I
    Hope this makes sense. Thanks.
    Last edited: Apr 30, 2013
  2. jcsd
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