Dunno.

I bet math and logic papers have a higher frequency of valid results than medicine papers have of true results, and that LW math and logic results are more often valid than not.

Mainstream philosophy, however, is vastly less truth-tracking than medicine. I bet LW has a better philosophical track record than mainstream philosophy (merely by being naturalistic, reductionistic, relatively precise, cogsci-informed, etc.), but I'm not sure by how much.