  We construct an analytic model for the mass distributions of superclusters
and clusters in each supercluster. Our model is a modification of the
Press-Schechter theory, and defines superclusters as the regions that have some
overdensity smaller than those for usual virialized objects. We compare the
mass functions with a catalog of superclusters in the Sloan Digital Sky Survey
Early Data Release and found that they are in reasonable agreement with each
other.
