Distribution of the AGN fraction, defined as the fraction of the IR emission originating from the AGN relative to the total IR emission (AGNFRAC), for BPT-selected star-forming galaxies (BPT-SF), BPT-selected AGNs, WISE-selected AGNs, and BL-AGNs observed in at most two WISE bands with S/N ≥ 3 (FLAGINFRARED ≤ 2; left plot) or at all four WISE bands (FLAGINFRARED = 4; right plot). The median AGNFRAC values are reported in the legend.