Fraction of AGN in barred and unbarred galaxies for all objects of the sample. Top left: sample before any matching. Top right: sample after the matching process by M_⋆, M_⋆,bulge and Σ₅. Bottom left: sample after the matching process by M_⋆, M_⋆,bulge, Σ₅ and colour (g − r). Bottom right: sample after the matching process by M_⋆, M_⋆,bulge, Σ₅ and Sérsic index. Error bars are 1σ confidence level using the beta distribution (Cameron 2011).