  We analyze subsamples of Abell and ACO cluster catalogs, in order to study
the spatial properties of the large scale matter distribution. The subsamples
analyzed are estimated to be nearly complete and are the standard ones used in
the correlation analysis by various authors. The statistical analysis of
cluster correlations is performed without any assumptions on the nature of the
distribution itself. The cluster samples show fractal correlations up to sample
limits ($\approx 70 h^{-1} Mpc$) with fractal dimension $D \approx 2$, without
any tendency towards homogenization. Our analysis shows that the standard
correlation methods are incorrect, since they give a finite correlation length
for a distribution that does not possess one. In particular, the so called
correlation length $r_{0}$ is shown to be simply a fraction of the sample size.
Moreover we conclude that galaxies and clusters are two different
representations of the same self similar structure and that the correlations of
clusters are the continuation of those of galaxies to larger scales.
