Cumulative distribution functions comparing the orbital period ratios of adjacent planet pairs to mean motion resonances (MMRs) for the field (blue) and overdensity (red) subsamples from the full Winter et al. (2020) catalog. The variables ζ₁ (left panel) and ζ₂ (right panel) quantify the difference between an observed period ratio and first-order and second-order MMRs, respectively, with ζ = 0 indicating that a pair coincides with an MMR. The dotted gray line shows the 1:1 relation between the CDF and ζ values for reference. The bottom right corner of each panel shows the p_KS and p_AD values for two-sample Kolmogorov–Smirnov and Anderson–Darling tests, respectively, against the null hypothesis that the field and overdensity samples are drawn from the same ζ distributions. There is no statistically significant difference between the ζ₁ distributions of the field and overdensity samples. However, the ζ₂ distributions of the field and overdensities are not drawn from the same population. The orbital period ratios of adjacent planets in the field sample statistically lie closer to second-order MMRs than in the overdensity sample.