AGN frequency and relative AGN excess in barred vs. unbarred disc galaxies. Top panel: Frequency of AGN (MIR: red, X-ray: blue, SED: orange) in S_bar (circles), W_bar (squares), A_bar (stars), and the corresponding U_bar control samples (empty symbols of the same type). Errors are calculated using binomial statistics. Bottom panel: Ratio of the AGN frequency in the barred samples to that in their corresponding U_bar controls (AGN excess).