  We use the 2dF Galaxy Group Catalogue constructed by Merch\'an & Zandivarez
to study the large scale structure of the Universe traced by galaxy groups. We
concentrate on the computation of the power spectrum and the two point
correlation function. The resulting group power spectrum shows a similar shape
to the galaxy power spectrum obtained from the 2dF Galaxy Redshift Survey by
Percival et al., but with a higher amplitude quantified by a relative bias in
redshift space of $b_s(k) \sim 1.5$ . The group two point correlation function
for the total sample is well described by a power law with correlation length
$s_0=8.9 \pm 0.3 \mpc$ and slope $\gamma=-1.6 \pm 0.1$ on scales $s < 20 \mpc$.
In order to study the dependence of the clustering properties on group mass we
split the catalogue in four subsamples defined by different ranges of group
virial masses. These computations allow a fair estimate of the relation
described by the correlation length $s_0$ and the mean intergroup separation
$d_c$ for galaxy systems of low mass. We also extend our study to the redshift
space distortions of galaxy groups, where we find that the anisotropies in the
clustering pattern of the 2dF group catalogue are consistent with gravitational
instability, with a flattening of the redshift-space correlation function
contours in the direction of the line of sight.
