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DLI Training Nesstar Workshop

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1 DLI Training Nesstar 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

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 (Document Type 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 2005 Questions 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> Title <titl>Domestic Violence Experience in Omaha, Nebraska, </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, </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> 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




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

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

29 Other study-related material
2.5 <othrStyMat> Other Study Description Materials 5.0 <othrMat> Other Study-related Materials

30 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

31 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

32 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

33 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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