Scott Alexander argues that selection bias, while a concern, is not a valid reason to automatically reject amateur online surveys, as professional studies also face similar limitations.

Scott Alexander examines seven cognitive traps that lead doctors to believe they're above-average, potentially applying to other client-choice professions.

Scott Alexander debunks a study claiming Victorians were smarter than modern people, showing it's based on flawed data comparison and ignores crucial factors like selection bias and demographics.

Scott Alexander explores how selection bias might create the stereotype of angry, vocal atheists, and speculates on how this concept might apply to other groups.