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I've often thought that this would be an interesting exercise if someone would undertake it. Just a reminder: in theory (IN THEORY) the first subject heading in an LC record is the one most semantically close to the assigned subject classification. So perhaps a first pass with the FIRST 6xx might give a more refined matching. And then it would be interesting to compare that with the results using all 600-651's. kc On 12/10/13, 1:18 PM, Edward Summers wrote: > 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 [1] to use as training data for some kind of clustering [2] algorithm. You might even be able to do something simple like keep a count of the Dewey ranges associated with each subject heading. > > I’m kind of curious myself, so I could work on getting the subject heading / dewey combinations if you want? > > //Ed > > [1] https://archive.org/details/marc_records_scriblio_net > [2] https://en.wikipedia.org/wiki/Cluster_analysis > > 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...) . Naïve idea...? >> >> Thanks for any clues, >> Irina >> >> >> ------- >> >> 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]> >> http://www.mpdl.mpg.de -- Karen Coyle [log in to unmask] http://kcoyle.net m: 1-510-435-8234 skype: kcoylenet