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Quantitative estimates are provided for the influence of luminosity selection effects present in a bright source sample on the observed correlation of the depolarisation rate Λ h with redshift z . It is shown that the observed correlation is partly intrinsic and partly due to luminosity effects. More specifically, we find that ~46% of the observed Λ h correlation with z can be attributed to strong luminosity selection effects in the sample. This shows that a significant fraction (~54%) of the observed correlation is cosmological in origin. It is concluded that there is a cosmological evolution of Λ h, over and above that resulting from luminosity selection effects, which may be related to the epoch dependent properties of the ambient medium through which the radio source components propagate.

Dependence of Faraday Effects on Radio Luminosity and Redshift