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I am familiar with how to do a Difference in Differences (DiD) but have never had to compute a confidence interval for it. I'm curious how one might go about that? As an example, here is some made up data: data DID; input ID time group value; cards; 1 1 1 1 2 1 1 2 3 1 1 1 4 1 1 3 5 1 1 2 6 1...

I'm wondering if someone could help me to correctly identify whether certain variables should be considered fixed or random effects. Just as context, I have a dataset of people (with information about them that I know is FIXED). I have a variable indicating to which healthcare practice...