Abstract
The null-correlation approach has been used to study the distribution of the 3CR sample of radio galaxies in the Hubble diagram, with the following results: This sample is about complete at flux density limit S 178=10 Jy, a relatively small number of strong sources S 178>100 Jy are missing (that correspond probably to local sources). The radio luminosity distribution function is given by a power law ∝ L - γ( z) with γ( z)≈2, which interprets the large scatter of the distribution in the Hubble diagram. Because of such a distribution in luminosity, this sample is not adapted for deriving the world model. The evolutionary effects are not substantial enough to be revealed within the range of observations.
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