  We present the full disk-fit results VANDAM survey of all Class 0 and I
protostars in the Perseus molecular cloud. We have 18 new protostellar disk
candidates around Class 0 and I sources, which are well described by a simple,
parametrized disk model fit to the 8 mm VLA dust-continuum observations. 33% of
Class 0 protostars and just 11% of Class I protostars have candidate disks,
while 78% of Class 0 and I protostars do not have signs of disks within our 12
AU disk diameter resolution limit, indicating that at 8 mm most disks in the
Class 0 and I phases are <10 AU in radius. These small radii may be a result of
surface brightness sensitivity limits. Modeled 8 mm radii are similar to the
radii of known Class 0 disks with detected Keplerian rotation. Since our 8 mm
data trace a population of larger dust grains which radially drift towards the
protostar and are lower limits on true disk sizes, large disks at early times
do not seem to be particularly rare. We find statistical evidence that Class 0
and I disks are likely drawn from the same distribution, meaning disk
properties may be defined early in the Class 0 phase and do not undergo large
changes through the Class I phase. By combining our candidate disk properties
with previous polarization observations, we find a qualitative indication that
misalignment between inferred envelope-scale magnetic fields and outflows may
indicate disks on smaller scales in Class 0 sources.
