On the Radio and Optical Luminosity Evolution of Quasars II - The SDSS
  Sample
  We determine the radio and optical luminosity evolutions and the true
distribution of the radio loudness parameter R, defined as the ratio of the
radio to optical luminosity, for a set of more than 5000 quasars combining SDSS
optical and FIRST radio data. We apply the method of Efron and Petrosian to
access the intrinsic distribution parameters, taking into account the
truncations and correlations inherent in the data. We find that the population
exhibits strong positive evolution with redshift in both wavebands, with
somewhat greater radio evolution than optical. With the luminosity evolutions
accounted for, we determine the density evolutions and local radio and optical
luminosity functions. The intrinsic distribution of the radio loudness
parameter R is found to be quite different than the observed one, and is smooth
with no evidence of a bi-modality in radio loudness. The results we find are in
general agreement with the previous analysis of Singal et al. 2011 which used
POSS-I optical and FIRST radio data.
