Hello Stata community,
I would like to ask a practical question about how to add group-specific linear trend in regression. Normally we would just add c.year#i.group to allow different groups having different linear trends. However, this would fit the linear trends using post-treatment data points. Is there a way to fit the linear trends with only pre-treatment data points (and extrapolating to the post treatment period)? Thank you.
I would like to ask a practical question about how to add group-specific linear trend in regression. Normally we would just add c.year#i.group to allow different groups having different linear trends. However, this would fit the linear trends using post-treatment data points. Is there a way to fit the linear trends with only pre-treatment data points (and extrapolating to the post treatment period)? Thank you.