Estimates for the uncertainty in radial velocity jitter, σ(Δv_rad). The multiple linear regression fit of σ(Δv_rad) with SNR(bHβ) and Δv_rad as the independent variables is plotted in purple. In order to represent the fit on a single independent variable, the sample was binned by SNR(bHβ) and the mean uncertainty value for each bin is plotted. Uncertainty estimates from the Δt < 2 days sample are plotted in blue. For both the MLR and Δt < 2 days plots, horizontal error bars represent the binning and the vertical error bars are estimated with the bootstrap method. The Δt < 2 days bins include 166, 93, 21, 34, and 12 pairs per bin, respectively, from low to high SNR.