  We test the periodicity of quasar redshifts in the 2dF and SDSS surveys. In
the overall surveys redshift peaks are already apparent in the brighter
quasars. But by analyzing sample areas in detail it is shown that the redshifts
fit very closely the long standing Karlssson formula and strongly suggest the
existence of preferred values in the distribution of quasar redshifts.
  We introduce a powerful new test for groups of quasars of differing redshifts
which not only demonstrates the periodicity of the redshifts, but also their
physical association with a parent galaxy. Further such analyses of the large
area surveys should produce more information on the properties of the
periodicity.
