  Much evidence has been presented in favor of and against the existence of two
distinct populations of quasars, radio-loud and radio-quiet. The SDSS differs
from earlier optically selected quasar surveys in the large number of quasars
and the targeting of FIRST radio source counterparts as quasar candidates. This
allows a qualitatively different approach of constructing a series of samples
at different redshifts which are volume-limited with respect to both radio and
optical luminosity. This technique avoids any biases from the strong evolution
of quasar counts with redshift and potential redshift-dependent selection
effects. We find that optical and radio luminosities of quasars detected in
both SDSS and FIRST are not well correlated within each redshift shell,
although the fraction of radio detections among optically selected quasars
remains roughly constant at 10% for z <= 3.2. The distribution in the
luminosity-luminosity plane does not appear to be strongly bimodal. The optical
luminosity function is marginally flatter at higher radio luminosities.
