Dunning and Kruger showed that students all thought they were in roughly the 70th percentile, regardless of where they actually ranked. That's it. The plots in

Dunning and Kruger showed that students all thought they were in roughly the 70th percentile, regardless of where they actually ranked. That's it. The plots in the original paper make that point very clear. It is unnecessary to walk the reader through autocorrelation in order to achieve a poorer understanding of that simple result.