Histograms of all Kepler candidate radii (gray) relative to those candidates that are in the optimistic HZ of their host star (green), shown on a logarithmic scale (top panel) and linear scale (bottom panel). The solid lines are power-law fits to the HZ candidates and the dashed lines are power-law fits to the entire Kepler distribution. Statistical analysis of the distributions shows that there is little evidence of a significant difference in the populations.