Figure 3. Power of coreferentiality detection in respect to the number of reference variables used.

100 respective data sets were simulated for different sample sizes N, different reference data dependency degrees δ (see insert) and either 40, 70, 100, 130 or 260 reference variables, and tested for coreferentiality with the permutation test described. The occasional deviation from monotonous behavior in the curve representing δ = 0.025, N = 100 is due to stochasticity.