i don't then.
I was taught dummy variables work as such:
They're a binary variable, so can only be 1 or 0. As such, you cannot use anything that isn't a binary variable (ie, you couldn't use an age group as a dummy variable -- you'd have to make up multiple variables for them.
So, for an age range fo say, 0 - 10, 11 - 20, and 21 - 30, you'd have to set it up as
Age 1 (for 0 - 10) and Age 2 (11 - 20).
You would then compare each one of those to the 21-30 range. Basically: "Is Age 1 true, where true means age is between 0 and 10)?"
And the same for Age 2.
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