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I suppose it would be helpful to actually know the problem that is trying to be solved here (I mean, a lot of people, including myself, are throwing out solutions to a problem that's never been actually defined). Ethan, what, exactly, are you trying to do? Do you want authorized headings? Or do you want LCSH that appears in the wild? -Ross. On Tue, Dec 8, 2009 at 10:35 AM, Ed Summers <[log in to unmask]> wrote: > 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. > > //Ed >