  The recent proposal by Kellermann (1993) to use the angular size/redshift
relation of compact radio sources to obtain information on the value of
cosmological parameters has provoked considerable discussion in the
astronomical community. I present here a careful re-analysis of the angular
size/redshift data of radio jets used by Kellermann (1993), using a
Kolmogorov-Smirnov test to check the independence of the distribution of linear
jet sizes from redshift under the assumption that no evolution is present in
the sources. The test takes into account biasing of the sample due to the
limited resolution. While the data are compatible with an Einstein-de~Sitter
Universe ($P=0.2$), they are not sufficient to rule out a significant part of
the $(\Omega_0,\lambda_0)$-plane.
