was .96 when a sum score of the four observations was analyzed, and .56 when only one data point was analyzed (α = .01; with a power of .99 for the true model). In the scenario with genetic innovation present and a genetic risk variant that entered the model at the fourth time point (h2 = .6; e2 = .4), the power dropped to .03 when a sum score was analyzed, whereas it stayed at .56 when only observations at the fourth time point were analyzed (α = .01; power true model > .99).
