Correlation coefficients obtained from a pool of N heteroskedastic groups. r
was obtained from pooling N groups of simulated data (shown in red), and was obtained from averaging within groups correlation (shown in blue); ρ is the true correlation within each group. This plot shows that the error between and ρ is smaller than the error between r
and ρ. Simulation parameters: μxy,i = (2,2), , −0.9 ≤ ρ ≤ 0.9, n
= 10, λ
= λ, and 0.01 ≤ λ ≤ 0.1 for i = 1,N and 10 ≤ N ≤ 100.