On errors of radio source position catalogs
  In this paper, a new method of investigation of the external radio source
position catalogs RSPCs stochastic errors is presented. Using this method the
stochastic errors of nine recently published RSPCs were evaluated. It has been
shown that the result can be affected by the systematic differences between
catalogs if the latter are not accounted for. It was also found that the formal
uncertainties of the source position in the RSPCs correlate with the external
errors. We also investigated several topics related to the formal uncertainties
and systematic errors of RSPC.
