We all know that – alongside global warming, Elon Musk, Vladimir Putin and other evils – selection bias is one of the largest threats to humanity* But how bad exactly is selection bias? This is what we aimed to explore in our recent paper: doi.org/10.1080/2153... *Perhaps a slight exaggeration…

Dan, you forgot Bibi Netanyahu in your list of evils.

First: What the frig is selection bias? If participation in research is non-random, then our analytic sample will differ from our target population of interest. This sample-population mismatch can result in selection bias, potentially messing up all our lovely causal inferences.