The difference between generalized DID and tradition

Generalized DID has only one treatment group and no control group.

Generally speaking, the usage scenario of DID is that in the panel data, individuals can be divided into two categories, namely, the "processing group" affected by policies and the "control group" not affected by policies. However, sometimes a policy is rolled out all over the country. At this time, there is only the treatment group, but there is no control group. You can try generalized DID.

Difference-Difference Model (DID) is the most commonly used non-experimental method in policy evaluation, in which the interactive item is the soul of DID. There are various forms of interactive projects, including: traditional DID；; Classics have done it; ; Different times; ; Generalized DID and heterogeneous DID.