findexact               Build an exact match variable given a matrix of
                        covarites ordered by the user according to
                        their importance.
glover                  Perfect matching and maximum matching in a
                        convex bipartite graph.
nearfine                Minimum-distance near-fine matching.
netfine                 Optimal near-fine match from a distance matrix.
nfmatch                 Minimum-distance near-fine matching.
nh0506                  Smoking and homocysteine levels in NHANES
                        2005-2006.
optcal                  Finds the optimal caliper width.
optconstant             Finds the optimal constant.
smahal                  Creates a robust Mahalanobis distance for
                        matching.
