structual break test / chow

Does anybody have experience with this test? I tried to find some extra information, but it is hard to find. Everything what I find is very detailed, and I just want to have some general information how to do this in stata. I know that I can do this with the test command, but how I should do this exactly is unclear.

What I want to do is: take a group of top performers (let's say the top 25 percentile) and check if there is a structural break in the next data. I want to check the performance and volume/turnover and if there is a structural break.

I hope that somebody can give me some tips.