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Table 3 Analytic recovery of pathway genetic effects for a continuous trait, based on 1000 (under alternatives) or 2000 (under the null) simulated studies of 1000 offspring

From: Simulating autosomal genotypes with realistic linkage disequilibrium and a spiked-in genetic effect

Simulation Setup

Simulation Results

 

True Shift in mean

Average Estimated Shift in Mean (95% CI for the Mean Shift in Mean)

Estimated Coverage of Nominal 95% CIs

Scenario

Allele Frequency for each of the 4 SNPs in each pathway

Pathway 1

Pathway 2

Pathway 1

Pathway 2

Pathway 1

Pathway 2

Stratified null

a

0

0

0.00 (−0.02,0.03)

−0.01 (−0.03,0.02)

0.949

0.958

Alternative b

0.3

0.1

0.15

0.10 (0.09,0.11)

0.15 (0.14,0.15)

0.949

0.95

Alternative b

0.2

0.1

0.15

0.10 (0.09,0.12)

0.14 (0.13,0.16)

0.949

0.96

  1. aBy design, the allele frequency for each of the 4 SNPs in each pathway in subpopulation one was close to 0.15 while that in subpopulation two was close to 0.5
  2. bSimulations under alternatives used homogeneous populations