EDIT: Let’s cool it with the downvotes, dudes. We’re not out to cut funding to your black hole detection chamber or revoke the degrees of chiropractors just because a couple of us don’t believe in it, okay? Chill out, participate with the prompt and continue with having a nice day. I’m sure almost everybody has something to add.
This particular hierarchy is specific to medical science, it doesn’t fit the other scientific disciplines perfectly.
Also, if I had a nickle for every conflicting pair of meta-analyses… happens so often.
Fair, but my point is that it illustrates how much stock one should put in single studies.