Graphical Analysis of the Common Trend Assumption and Diff-in-Diffs: Causal Inference Bootcamp

Here we see what the common trend assumption looks like when we plot our data in graphs, and we see how to get the differences-in-differences estimate from the chart. We also discuss how to check the common trends assumption.

[saket]

Can't believe these videos don't have more likes and comments. Dr. Masten and team have done a great job. I find myself coming back to these videos many times. Thank you for your hard work and for making Causal Inference more accessible to everybody!

[RosiePosie]

Is common trends the same as parallel trends?

[ShochrulRohma]

thanks for the video, how if we only have one pre-treatment period and one post-treatment period?

[saikoujeromejuwara]

Thank you very much for your videos! I have watched all of the bootcamp and it really helped me with my papers. Any chance you'd continue this series, like on synthetic control methods? Greetings from Berlin

[pututp]

Hi professor. It seems that your graph is too good to be true. What do you suggest to test the assumption given a panel data set? What should be tested? Is it the slope to be tested?