(a) The relation between the amplitude of variability and the black hole mass; (b) the relation between the amplitude of variability and the accretion-disk luminosity; and (c) the relation between the amplitude of variability and accretion rates. The red dots represent FSRQs, the blue dots represent BL Lacs, the green dots represent BCUs, and the cyan dots represents NLS1s. The shaded gray areas correspond to 1σ confidence bands. The black line is the best fit.