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