I have a question about treatment and control groups - DiD using repeated cross sectional data.
If no control group exists (due to lack of data) in pre-treatment period for an age specific cohort. Is it possible to construct a control group made up of the same age individuals from the same region but in a different time period i.e. post treatment (5 years after treatment)? Treatment = exposure to conflict thus control group will not have been exposed and maybe there are no spillover effects. Robustness checks?