Completeness of the BOSS target samples, relative to the total abundance of all three target classes. At ﹩\mathrm{log}{M}_{* }=11.4﹩, indicated by the vertical dash line, the CMASS sample is only 50% complete. Adding the SPARSE sample brings the completeness at this mass scale up to 75%. The CMASS sample by itself is >95% complete at ﹩\mathrm{log}{M}_{* }\gt 11.7﹩. At lower masses, the total abundance is itself incomplete. We thus make a conservative completeness limit of ﹩\mathrm{log}{M}_{* }=11.4﹩ for the full BOSS sample, at which scale both SPARSE and WISE abundances have steep mass functions.