Figure 1.

Comparison of the empirical and theoretical χ² p-value distributions under the alternative hypothesis when the odds ratio under the alternative hypothesis is 1.2. Population parameters under the null were π₁₁ = 0.25, π₁₀ = 0.25, π₀₁ = 0.25, π₀₀ = 0.25 and under the alternative were δ₁₁ = 0.26, δ₁₀ = 0.24, δ₀₁ = 0.24, δ₀₀ = 0.26.