Her er et glimrende eksempel på, hvordan selektions bias kan føre til helt forkerte konklusioner. Eksemplet er fra Michel Nivard, der kritiserer Güllich et al. (2025) i Science, som konkluderer.

Across the highest adult performance levels, peak performance is negatively correlated with early performance.

Til det svarer Nivard bl.a.:

It becomes clear from Figure 1 that although early and adult performance are positively related in the population, conditioning on elite status reverses the association. The negative slope among elite performers is therefore not evidence against a causal role of early performance; it is the mechanical consequence of selection.