- [[six sigma standard deviation]], [[when to increase or decrease variation]] # Idea Fisher's theorem is a theorem in ecology that combines three concepts: - there is no cardinal; i.e., there is a lot of variation - rugged landscape; i.e., lots of [[optimization|optimal]] points - [[replicator dynamics]] Using [[replicator dynamics]], we can show that higher variance increases rate of adaptation. In fact, the change in average fitness due to selection will be proportional to the variance. That is, this theorem suggests that more variation is better (contra [[six sigma standard deviation|six sigma quality control]] or the idea that less variation and noise is better). # References - https://www.coursera.org/learn/model-thinking/lecture/eepgT/fishers-theorem