There’s this discussion going on over at Respectful Insolence between an anti-vaccine activist and an epidemiologist, like me. The anti-vaccine activist — whom I thought was banned from there (oops) — is known to be quite “dense” when it comes to epidemiology and biostatistics. I don’t blame him, much. His highest degree in science is in Fire Science. I don’t know where this guy when to school, but most programs I’ve found, like this one, don’t have biostatistics or statistical reasoning in their curricula. This would explain the activist’s misunderstanding of a case-control study. Like the PhD in Biochemistry being discussed by Orac in that post, the activist thinks that matching cases and controls in a study somehow disallows for the examination of their vaccine status and its relationship to autism. They think that cases (autistic children) should have a different vaccine status than controls (neurotypical children), and then we can see if they have a difference in vaccine exposures.
Can you see the logical fallacy in that? Continue reading