I came across the stata code that has ## or # in it. I googled it but couldn’t find . Please let me what does that mean in stata?
I came across the stata code that has ## or # in it. I
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I came across the stata code that has ## or # in it. I googled it but couldn’t find . Please let me what does that mean in stata?
You can put a # between two variables to create an interaction–indicators for each combination of the categories of the variables. You can put ## instead to specify a full factorial of the variables—main effects for each variable and an interaction.
Check
http://www.stata.com/capabilities/overview/factor-variables/