I am new here and hope that you can help me with my questions as I cannot find an answer myself. For a paper I am working on, I did some research about Regression Discontinuity Design. I was wondering what exactly the difference to a simple dummy variable is? For example, if I have a change in regulations on the 12 of May 2018, then I can use Regression Discontinuity Design to analyse the effect of the change in the regulatory framework. But to my understanding, the only thing that I am doing under the Regression Discontinuity Design is to implement a dummy variable that is "1" if the observation is after the 12th of May 2018 and "0" if it is before. So my questions is: Is Regression Discontinuity Design in this context really just inserting a dummy variable that specifies whether it is before or after the cutoff date?

Thank you very much for taking the time to answer the question.

All the best,

Timo