Thanks for reading, I’m glad you enjoyed the piece!
In analyzing any study, I would say the most important thing is to check the source. The Fryer study Mac Donald cites, for example, was not even been peer reviewed when she (and others) cited it, and I don’t think it has been yet. So taking his findings as evidence is already problematic.
The other thing to look at is their theory and methodology, because it identifies how the author(s) is going about gathering and presenting their information. Fryer’s study does show some methodological problems, namely in what it defines as “racial bias”. I will refer you to a blog post by Justin Feldman, an SD at Harvard School of Public Health, who I think does a very good job of breaking this down.
In terms of the University of Washington study, I have seen result with similar experiments that have yielded different results (Feldman mentions this as well). Let me know what you find, though. I’d love to read your thoughts and findings on this.