Hi,
I would like to run a Difference-in-differences regression and I'd appreciate some advice regarding methodology.
The dataset I am working with has a high level of attrition. When running a DID, I get two different coefficients depending on whether or not I only keep respondents who took part in both phases of the study. I was wondering which one was methodologically correct. Should I run the DID regression but only keep the respondents who took part in both periods? Or keep the attriters in the DID regression?
Out of precaution, I tested whether there was attrition bias and added Inverse-probability weights for each respondent with complete data.
Thank you
I would like to run a Difference-in-differences regression and I'd appreciate some advice regarding methodology.
The dataset I am working with has a high level of attrition. When running a DID, I get two different coefficients depending on whether or not I only keep respondents who took part in both phases of the study. I was wondering which one was methodologically correct. Should I run the DID regression but only keep the respondents who took part in both periods? Or keep the attriters in the DID regression?
Out of precaution, I tested whether there was attrition bias and added Inverse-probability weights for each respondent with complete data.
Thank you
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