Relative fraction of radio source types as a function of S_{1.4 GHz}. The black triangles represent all definite radio AGN (whether classified or not), the blue circles RL HERGs, the purple circles RQ HERGs, the red squares LERGs, the magenta triangles unclassified AGN (which potentially include LERGs and RL HERGs), the green diamonds SFGs, and the orange pentagons unclassified sources (which potentially include LERGs, RQ HERGs, and SFGs). The y-axis error bars for each population are Poissonian and are given by Eq. (15), calculated for each S_{1.4 GHz} bin. The errors along the x-axis are the S_{1.4 GHz} bin widths.