Statistical Analysis of Quasar Data and Hubble Law

The linearity of the Hubble relationship (i.e. between m and z) has been tested for galaxies and supernovea for low redshifts. We have studied this relationship for quasars for data taken from Veron Cetti Catalogue(2003).The data from Veron Cetti Catalogue for quasars appear to be truncated. The data have been analyzed using various statistical methods which are suitable for analysing the truncated data. This analysis shows lineraity (in log z) of Hubble law for very small z but non-linearity for high redshift.This will shed new light not only on the quasar astronomy but also in the cosmological debate.