Holy shit. That data is amazing. The only question I have is if it takes into account college majors who don't actually work in their field of study. Example: I studied psychology but had trouble getting a job I wanted and am now doing something else. Is that factored into the "median wage"? I tried looking through the articles but am having trouble finding if the figures are specific to people with majors who now work in their field of study or not.
The data is your tax dollars at work. It had one round of processing by Five Thirty Eight and is for "recent college grads." From the Github it appears they are looking at wages and majors of people under 28. "Job within major" is not something the data captures. I don't know if it's within the data itself.