On Tue, Dec 8, 2009 at 10:16 AM, Karen Coyle <[log in to unmask]> wrote:
> Couple of things: first, what we have at id.loc.gov is NOT LCSH, but a copy
> of the LC subject authority file. The entries in this file form the basis
> for subject headings, most of which add "facets" to the authority entry when
> forming the subject heading. One could do a left-anchored match against
> actual headings, and that might provide some interesting statistics.
Yes, using the actual headings extracted from bibliographic data seems
to be a better approach. It's easier to rank them, and as Karen points
out you get the actual post-coordinated headings, not just the
headings LC has decided to establish authority records for.