passages: PMC-2648768-caption-01__text
passages: caption
passages: Power (Y-axis) as a function of main effects (x-axis). For a pure main-effects model (x-axis = a1 > 0; interaction effects a2 = a3 = 0 are all zero), Figure 1 shows that pattern (solid red line) and single-locus (broken blue line) approaches have virtually the same power.
  