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\subsubsection{Yielding Post-Encroachment Time}  A stepwise linear regression is performed on median $yPET_{\zeta < 5}$ at each site, to test all explainable differences between sites, as  shown in Table~\ref{tab:analysis_zones}. $yPET_{\zeta < 5}$ observations are separated into lead $yPET_{\zeta < 5}$---when 5}$: when  the roundabout road user enters the merging zone first---and first; and  lag $yPET_{\zeta < 5}$---when 5}$: when  the approach road user enters the merging zone first. The coefficients of regression, adjusted $R^2$, Wald test score, and number of observations are provided in Table~\ref{tab:se_regression_mean_speed}. No suitable regression model is found for lead $yPET_{\zeta < 5}$. Meanwhile, while Outside Radius and Flow are found to be associated with lag $yPET_{\zeta < 5}$, having a moderately powerful relationship, region is not found to be significantly correlated with median lag $yPET_{\zeta < 5}$ either.