In the social sciences, the ergodic hypothesis corresponds to the assumption that individuals are representative of groups, and vice-versa, that group averages can adequately characterize what might be seen in an individual. This appears to not be the case: group level data often gives a poor indication of individual level variation, as individual standard deviations (SDs) tend to be almost eight times larger than group level SDs of the same people. Subsequently a third of the individual observations falls outside a 99.9% confidence interval of group level data.