  Hardness-intensity diagrams (HIDs) have been used with great success to study
the accretion states and their connection to radio jets in X-ray binaries
(XRBs). The analogy between XRBs and active galactic nuclei (AGN) suggests that
similar diagrams may help to understand and identify accretion states in AGN
and their connection to radio loudness. We construct ``disc-fraction luminosity
diagrams'' (DFLDs) as a generalization of HIDs, which plot the intensity
against the fraction of the disc contribution in the overall spectral energy
distribution (SED). Using a sample of 4963 Sloan Digital Sky Survey (SDSS)
quasars with ROSAT matches, we show empirically that an AGN is more likely to
have a high radio:optical flux ratio when it has a high total luminosity or a
large non-thermal contribution to the SED. We find that one has to consider at
least two-dimensional diagrams to understand the radio loudness of AGN. To
extend our DFLD to lower luminosities we also include a sample of
low-luminosity AGN. Using a simulated population of XRBs we show that stellar
and supermassive BHs populate similar regions in the DFLD and show similar
radio/jet properties. This supports the idea the AGN and XRBs have the same
accretion states and associated jet properties.
