Definition

Here we give the best individual fitness $N$ (the population size) and continue in decreasing order to the worse individual with fitness $1$. Let $R(i)$ denote the ranking of individual $i$, defined such that the best individual $i_{best}$ has ranking $R(i_{best})=1$, the fitness values are obtained like so: $$F_{i}^{rank}=N+1-R(i)$$