This is my inclination. However, if the algorithm doesn't incorporate
values from the tables used to synthesize Dewey numbers, identifying the
stems of numbers may be tricky. It might be worth calling up someone at a
major Dewey library like UIUC or Northwestern to see if they might be
willing to provide data to add to what you get from LC.

kyle


On Tue, Dec 10, 2013 at 1:18 PM, Edward Summers <[log in to unmask]> 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
>