15^th^ 2019. As this sample is undoubtably subject to a variety of complex selection effects, its use provides a reasonable assessment of the degree that such unmitigated effects have on our analysis. Again and subsequently the sample is scaled to match the other distributions.

-   To address biases in host redshift measurement as a function of redshift itself, we plot the [@Perley_shoals_masses] SHOALS and [@BAT6] BAT6 samples, which claim to be unbiased in their selections. We also plot the Optically Unbiased Gamma-Ray Burst Host Survey (TOUGHS) sample updated using all currently known spectroscopically determined redshift values for objects from that sample. TOUGHS is an attempt to provide a host sample which is not biased by host absorption of the optical afterglow of the LGRB. Of the 69 [*Swift*]{} GRB hosts we find 58 of them have exact redshift values. We note that one of the missing redshifts is due to a bright foreground star and can thus be excluded from the sample without introducing any biases, giving the TOUGHS redshift sample an 85% effective completeness.

-   To also sample bias in host galaxy mass measurement we plot the subset of [@Perley_shoals_masses] SHOALS galaxies with mass values (excluding limits) as well 