Question about interaction

[Thierry Grandgirard]

I run regression and I would to show the interaction/difference between two variables.

First, I use the ## to show the interaction.
Then I run the regression with the two categorical variables (the second variable is a subgroup of the first, the two group aren't disctinct group). The result shows me the difference between the two categorical variables. How explain that the value for the subgroup is the difference between the two group?

What's the best to show the interaction and the difference between the two groups? The first regression or the second one?

[Phil Bromiley]

Please follow the FAQ on asking questions - provide Stata code in code delimiters, readable Stata output, and sample data using dataex.

If you look at your posting, I would need a microscope to read what you posted.

Please start over and post according to the FAQ.