Hello,

I'm doing a relatively simple analysis for a large group of banks for years 2011-2020. In particular, I measure the degree of competition between the banks in the sample.
The competition is measured by a statistic that sums up 4 parameters from a fixed effect regression.

What I would like to do is see whether the degree of competition changed over time. Tbh, I'm not sure how to do it.

I had an idea to break the sample into two or three, and see how this sum of the 4 parameters changes from across the cutoffs. However, this would require additional testing (perhaps a simple F-test (?)).

I would be grateful for anyone's guidance on how to proceed.

Best,
Francis