  We present an analytic description of numerical results for the ghost
propagator G(p^2) in minimal Landau gauge on the lattice. The data were
produced in the SU(2) case using the largest lattice volumes to date, for d =
2, 3 and 4 space-time dimensions. Our proposed form for G(p^2) is derived from
the one-loop relation between ghost and gluon propagators, considering a
tree-level ghost-gluon vertex and our previously obtained gluon-propagator
results \cite{Cucchieri:2011ig}. Although this one-loop expression is not a
good description of the data, it leads to a one-parameter fit of our
ghost-propagator data with a generally good value of \chi^2/dof, comparable to
other fitting forms used in the literature. At the same time, we present a
simple parametrization of the difference between the lattice data and the
one-loop predictions.
