Expected power for an association study from the derived equations and observed averaged power from simulation.

<p><i>h</i>²: variance explained by the locus.</p><p>a: in case-control samples, 50% of the sample are cases, P = 0.5.</p><p>Exp: Expected power based on NCP derived from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0071494#pone.0071494.e002" target="_blank">equation (1</a>)∼(4).</p><p>Obs: Averaged power over 10000 replicates of simulation.</p><p>SE: Empirical standard error over 10000 replicates.