I want to know if difference-in-difference approach can be used for two treatment groups. Can I use it it between them or should I first identify a control group and then compute the diff-in-diff between the two sets i.e. treatment one and control and second between treatment two and control?
or is there be any other approach to address this problem??
Hassan Izzeddin Sarsak
Difference in difference approach is a quasi-experimental method that is more used to find changes in outcomes over time between a treatment group and a comparison group.
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