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. 2013 Jul 4;14:214. doi: 10.1186/1471-2105-14-214

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Copyright © 2013 Almeida-de-Macedo et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mean differences across a pool of N groups causes spurious correlations. r_xy was obtained from combining N groups of simulated data; simulation parameters: μ_xy,1 = (α,0), μ_xy,2 = (0,α), −10 ≤ α ≤ 10, and μ_xy,i = (2,2) for i ≥ 3; n_i = 10, λ_i = λ, 0.01 ≤ λ ≤ 0.1, ∀ i = 1,N, and 10 ≤ N ≤ 100.

Inline graphic — Mean differences across a pool of N groups causes spurious correlations. r_xy was obtained from combining N groups of simulated data; simulation parameters: μ_xy,1 = (α,0), μ_xy,2 = (0,α), −10 ≤ α ≤ 10, and μ_xy,i = (2,2) for i ≥ 3; n_i = 10, λ_i = λ, 0.01 ≤ λ ≤ 0.1, ∀ i = 1,N, and 10 ≤ N ≤ 100.