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Re: st: new dummy variable based on two categorical variables

From   Richard Williams <[email protected]>
To   [email protected]
Subject   Re: st: new dummy variable based on two categorical variables
Date   Sat, 16 Oct 2010 19:34:42 -0500

At 06:22 PM 10/16/2010, Delahanty, Ryan wrote:
I had such awesome help from you stats ballers on this list with the last Q, I thought I'd take a spin again.

Please correct my language in this email if I'm off in proper terms.

Say I have two variables with i and j different levels, like this: var1=1,2,3,4; var2=1,2,3
And I want to get ORs on all 12 categories: 1,1; 1,2; 1,3; 2,1... 4,3.

What is the most efficient way to make a new categorical variable that contains all i x j combinations?

I know once complete, I want to do logistic this way:
xi, prefix(): logistic affec i.newvar

If you have Stata 11, you want

logistic affect var1#var2

Even then, you don't get all i x j combos; something has to serve as the reference.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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