  The quality of supernova data will dramatically increase in the next few
years by new experiments that will add high-redshift supernova to the currently
known ones. In order to use this new data to discriminate between different
dark energy models, the statefinder diagnostic was suggested and investigated
by Alam et al. in the light of the proposed SuperNova Acceleration Probe (SNAP)
satellite. By making use of the same procedure presented by these authors, we
compare their analyzes with ours, which shows a more realistic supernovae
redshift distribution and do not assume that the intercept is known. We also
analyzed the behavior of the statefinder pair {r,s} and the alternative pair
{s,q} in the presence of offset errors.
