Not a naive idea at all. If you have the stomach for it, you could extract the Subject Heading / Dewey combinations out of say the LC Catalog MARC data  to use as training data for some kind of clustering  algorithm. You might even be able to do something simple like keep a count of the Dewey ranges associated with each subject heading.
Iím kind of curious myself, so I could work on getting the subject heading / dewey combinations if you want?
On Dec 10, 2013, at 8:18 AM, Irina Arndt <[log in to unmask]> wrote:
> Hi CODE4LIB,
> we would like to add DDC classes to a bunch of MARC records, which contains only LoC Subject Headings.
> Does anybody know, if a mapping between LCSH and DDC is anywhere existent (and available)?
> I understood, that WebDewey http://www.oclc.org/dewey/versions/webdewey.en.html might provide such a service, but
> ∑ we are no OCLC customers or subscribers to WebDewey
> ∑ even if we were, I'm not sure, if the service matches our needs
> I'm thinking of a tool, where I can upload my list of subject headings and get back a list, where the matching Dewey classes have been added (but a 'simple' csv file with LCSH terms and DDC classes would be helpful as well- I am fully aware, that neither LCSH nor DDC are simple at all...) . NaÔve idea...?
> Thanks for any clues,
> Irina Arndt
> Max Planck Digital Library (MPDL)
> Library System Coordinator
> Amalienstr. 33
> D-80799 Muenchen, Germany
> Tel. +49 89 38602-254
> Fax +49 89 38602-290
> Email: [log in to unmask]<mailto:[log in to unmask]>