Comparison of the inferred z > 1.5 galaxy stellar mass function (colored curve with 1 and 2σ envelopes) fitted to observed measurements (gray points). We scale the Tinker et al. (2008) halo mass function (HMF; lower bound of the gray shaded region) by 0.018 corresponding to the stellar-to-halo mass relation at z = 0 and (Behroozi et al. 2013) to produce an idealized SMF (gray curve). Upper limits on the SMF at each redshift are derived from the HMF assuming a fixed baryon fraction (0.166). Upper limits for empty bins are shown by the horizontal gray line with an arrow. Mass incomplete measurements are not shown.