  We have recently extended our ongoing survey of the local white dwarf
population, effectively doubling the sample volume. Based upon the latest
distance determinations, Holberg et al. (2016) estimated the present 20 pc and
25 pc samples were about 86 and 68 percent complete, respectively. Here we
examine how the completeness of the 25 pc sample depends upon other observables
such as apparent magnitude, proper motion, photometric color index, etc. The
results may provide additional clues to why Sirius-Like systems are
underrepresented in the extended 25 pc sample and how additional nearby single
white dwarf stars may be found.
