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DLI Training Nesstar Workshop

DLI Training Nesstar Workshop. Ernie Boyko, Carol Perry Ontario DLI Training University of Guelph, Guelph, ON April 10-11, 2006. DDI Refresher. What, Why, How?. Data Documentation Initiative.

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DLI Training Nesstar Workshop

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  1. DLI TrainingNesstar Workshop Ernie Boyko, Carol Perry Ontario DLI Training University of Guelph, Guelph, ON April 10-11, 2006

  2. DDI Refresher What, Why, How?

  3. Data Documentation Initiative • The Data Documentation Initiative is an international effort to establish a standard for technical documentation describing social science data • http://www.icpsr.umich.edu/DDI/index.html

  4. DTD - Document Type Definition • Consists of a Tag Library • Tags have been developed by DDI • A set of tags, when filled, are known as a codebook • DDI – intends to comply to Dublin Core

  5. Tags • Tags present English language descriptions of XML (eXtensible Markup Language) • Each tag can be optional or mandatory, repeatable or non-repeatable • Set of tags for each section of DTD

  6. 5 Sections of DTD(DocumentType Definition) • 1.0 Document Description • 2.0 Study Description • 3.0 Data File Description • 4.0 Variables Description • 5.0 Other Study Materials

  7. Document Description • Bibliographic description of the DDI document itself, otherwise known as a marked-up codebook

  8. Study Description • Describes Study or Survey • Includes title, abstract, keywords, author, publisher, collection methods, etc.

  9. Data File Description • Contains information describing the data file • Includes file name, file type, case quantity, logical record length, total number of records, etc.

  10. Variables Description • Describes each variable • Includes variable label, values, value label, question, summary statistics, etc.

  11. Other Study Materials • Includes documentation files in a variety of formats: pdf, excel, word, etc. • Includes codebooks, questionnaires, user guides, variability tables, etc.

  12. Fast forward … • What has been done since 2004…

  13. DLI Training 2005 • The group tagging workshop

  14. CANDDI Tag working group • Michelle Edwards - UG • Marie-Joseè Bourgeois – DLI • Irene Wong – RDC UA • Jane Fry – Carleton U

  15. DINO Dec 2005Questions for the Group • Sharing the metadata xml files • What sections of DDI should be included in the exchange? • All five sections? • Select sections?

  16. How do we choose the tags? • Preliminary set put together by U of Guelph in consultation with DLI staff • Carleton, Guelph, DLI team using same set of tags • Revision 4 was distributed to CANDDI tag team in Dec 2005 • Work in progress

  17. How do we fill the tags? • DDI document occasionally vague • Dublin Core tags –mandatory • Do we fill these tags using examples from DDI document? • How do we build consistency?

  18. Example – Study title • Examples from DDI documentation: • <titl> 2.1.1.1 Title • <titl>Domestic Violence Experience in Omaha, Nebraska, 1986-1987</titl> • <titl>Census of Population, 1950 [United States]: Public Use Microdata Sample</titl> • <titl>Monitoring the Future: A Continuing Study of American Youth, 1995</titl>

  19. How would a cataloguer do it? • <titl>Domestic violence experience in Omaha, Nebraska, 1986-1987</titl> • <titl>Census of population, 1950 [United States]: Public use microdata sample</titl> • <titl>Monitoring the future: A continuing study of American youth, 1995</titl>

  20. Balance • Between structure of DDI and need to co-ordinate with cataloguing rules

  21. How do we decide … • What is the right way to fill a tag for our needs • Some tags require consensus on how they should be filled

  22. Example • <IDNo> 2.1.1.5 • Description: Unique string or number (producer’s or archive’s number) for the data collection. An “agency” attribute is supplied.

  23. Choices – StatCan data • Bibliocat – pre-2000 surveys • Statcan catalogue • SDDS survey number in IMDB

  24. Which choice is right for us? • Survey of Household Spending ID • <IDNo>62M0004</IDNo> • <IDNo>62M0004XCB</IDNo> • <IDNo>3508</IDNo>

  25. Another decision, same tag • Year must be added after IDNo to distinguish files • <IDNo>3508-2000</IDNo> • What is appropriate separator? • – , / : ; • Will any cause problems later on?

  26. Other study-related material • 2.5 <othrStyMat> • Other Study Description Materials • 5.0 <othrMat> • Other Study-related Materials

  27. 2.5 <othrStyMat> • may include: appendices, sampling information, weighting details, methodological and technical details, publications based upon the study content, related studies or collections of studies, etc

  28. How do we identify them? • By catalogue number • What if they are on-line publications • Link to pdf? Link to dsp site? • Link to StatCan catalogue page • Link to them in our own collection

  29. 5.0 <otherMat> • may include: questionnaires, coding notes, SPSS/SAS/Stata setup files (and others), user manuals, sample computer software programs, glossaries of terms, interviewer/project instructions, maps, database schema, data dictionaries, coding information, interview schedules, missing values information, frequency files, variable maps, etc

  30. We need to collaborate… • How do we decide as a group what we want • How do we articulate our reasons for making the decision

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