Dear Statalist Users,

My data is on the district-year level and I am looking at the effect of mine openings on child health. In this context, I would like to do a Difference-in-Differences analysis. However,
the treatment (mine opening) in the treatment districts occured in various different years.
I am using cem from SSC in stata 15.0 in order to reduce imbalance in co-variates between treated and control groups.
After having created my matched treatment-control pairs I would like to impute to the control district the same treatment year as the year of treatment of its matched treatment district.
The problem is that I could not find any function in cem allowing to identify the matched pairs.

Any help or advice is greatly appreciated.