  We present the results from two-point spatial correlation analyses on X-ray
confirmed northern Abell clusters. The cluster samples are subsets of a
volume-limited ROSAT All-Sky Survey study of 294 Abell clusters of which 240
are X-ray luminous. We examined magnitude- and volume-complete samples for
differences according to richness and X-ray luminosity. For R>=1 clusters, we
find r_0 = 22h^-1Mpc and gamma = -1.7, which is consistent with previous
analyses of visually selected clusters. We also find no indications of
line-of-sight anisotropies. For R >= 0 clusters, we find r_0= 17.5h^-1Mpc which
is considerably lower than recent determinations of r_0 for similar X-ray
bright cluster samples (e.g. the XBACs and the RASS1 clusters). All of the R>=0
X-ray confirmed samples, including the XBACs and RASS1 clusters, show
line-of-sight anisotropies. Since X-ray emissions confirm a cluster's reality,
we conclude that these anisotropies are not the result of spuriously selected
clusters. We also examine the Abell clusters for the depedence of r_0 and gamma
on X-ray luminosity, and find no evidence for r_0 to grow with increasing X-ray
luminosity thresholds. This is contrary to similar L_x vs. r_0 analyses of the
RASS1 and XBACs cluster samples. We describe selection effects within the
flux-limited XBACs and RASS1 samples and suggest how they can affect both the
size of r_0 and its dependence on L_x.
