  Three dimensional Ising model ferromagnets on different lattices with nearest
neighbor interactions, and on simple cubic lattices with equivalent
interactions out to further neighbors, are studied numerically. The
susceptibility data for all these systems are analyzed using the critical
Renormalization Group Theory formalism over the entire temperature range above
Tc with an appropriate choice of scaling variable and scaling expressions.
Representative experimental data on a metallic ferromagnet (Ni) and an
elementary fluid (Xe) are interpreted in the same manner so as to estimate
effective coordination numbers.
