dli training april 2004 kingston ontario. ddi what, why, how?
TRANSCRIPT
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DLI TrainingDLI Training
April 2004April 2004
Kingston OntarioKingston Ontario
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DDIDDI
What, Why, How?What, Why, How?
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Data Documentation Data Documentation InitiativeInitiative
•The Data Documentation Initiative is an international effort to establish a standard for technical documentation describing social science data
• http://http://www.icpsr.umich.edu/DDI/index.htmlwww.icpsr.umich.edu/DDI/index.html
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Getting Used to AcronymsGetting Used to Acronyms
• You’ll see…..You’ll see…..
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DTD - Document Type DTD - Document Type DefinitionDefinition
• Consists of a Tag Library Consists of a Tag Library
• Tags have been developed by DDITags have been developed by DDI
• A set of tags, when filled, are known A set of tags, when filled, are known as a codebookas a codebook
• DDI – intends to comply to Dublin DDI – intends to comply to Dublin CoreCore
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TagsTags
• Tags present English language Tags present English language descriptions of XML (eXtensible descriptions of XML (eXtensible Markup Language)Markup Language)
• Each tag can be optional or Each tag can be optional or mandatory, repeatable or non-mandatory, repeatable or non-repeatablerepeatable
• Set of tags for each section of DTDSet of tags for each section of DTD
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5 Sections of DTD5 Sections of DTD ((DocumentDocument Type DefinitionType Definition))
• 1.0 Document Description1.0 Document Description
• 2.0 Study Description2.0 Study Description
• 3.0 Data File Description3.0 Data File Description
• 4.0 Variables Description4.0 Variables Description
• 5.0 Other Study Materials5.0 Other Study Materials
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Document DescriptionDocument Description
• Bibliographic Bibliographic description of the description of the DDI document DDI document itself, otherwise itself, otherwise known as a known as a marked-up marked-up codebookcodebook
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Study DescriptionStudy Description
• Describes Study or Describes Study or SurveySurvey
• Includes title, Includes title, abstract, keywords, abstract, keywords, author, publisher, author, publisher, collection methods, collection methods, etc.etc.
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Data File DescriptionData File Description
• Contains Contains information information describing the data describing the data filefile
• Includes file name, Includes file name, file type, case file type, case quantity, logical quantity, logical record length, total record length, total number of records, number of records, etc. etc.
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Variables DescriptionVariables Description
• Describes each Describes each variablevariable
• Includes variable Includes variable label, values, value label, values, value label, question, label, question, summary statistics, summary statistics, etc.etc.
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Other Study MaterialsOther Study Materials
• Includes Includes documentation files documentation files in a variety of in a variety of formats: pdf, excel, formats: pdf, excel, word, etc.word, etc.
• Includes codebooks, Includes codebooks, questionnaires, user questionnaires, user guides, variability guides, variability tables, etc.tables, etc.
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Choosing TagsChoosing Tags
• http://http://www.icpsr.umich.edu/DDI/users/dtd/cwww.icpsr.umich.edu/DDI/users/dtd/codedtd.htmlodedtd.html
• Select tags from each DTD section for Select tags from each DTD section for templatetemplate
• Each tag represents a searchable Each tag represents a searchable elementelement
• Choose carefully – definitions are Choose carefully – definitions are provided on-lineprovided on-line
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Codebook TemplateCodebook Template
• Over 300 tags to Over 300 tags to choose fromchoose from
• DDI suggests DDI suggests starting with set of starting with set of Recommended Recommended ElementsElements
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Making TemplatesMaking Templates
• Pre-fill tags which are common to Pre-fill tags which are common to each dataset and save as templateeach dataset and save as template
• One template for Stats Canada One template for Stats Canada surveyssurveys
• One template for ICPSR SurveysOne template for ICPSR Surveys
• One generic to cover other sources One generic to cover other sources
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Making Templates - Making Templates - exampleexample
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Marking up documentMarking up document
Tags can be filled by a variety of methods:Tags can be filled by a variety of methods:
• Cut and paste or type in information Cut and paste or type in information
• Extract information using custom scripts, Extract information using custom scripts, xml editors or custom softwarexml editors or custom software
• Follow tag descriptions carefullyFollow tag descriptions carefully
• Establish guidelinesEstablish guidelines
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Completed CodebookCompleted Codebook
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Displaying codebookDisplaying codebook
• XML is not a visual display language XML is not a visual display language on the webon the web
• Transform codebook using XSL/XSLT Transform codebook using XSL/XSLT (extensible stylesheet language)(extensible stylesheet language)
• Stylesheets control the output display Stylesheets control the output display
• Software required to read stylesheets, Software required to read stylesheets, eg. Cocoon, Saxoneg. Cocoon, Saxon
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Stylesheets – what they look Stylesheets – what they look likelike
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StylesheetsStylesheets
• Create your ownCreate your own
• Borrow from others – examples Borrow from others – examples available on DDI siteavailable on DDI site
• Purchase proprietary software to do Purchase proprietary software to do it for you –example NESSTARit for you –example NESSTAR
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Final productFinal product
......................................................
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Where to go from here…..Where to go from here…..
• BorrowBorrow
• ShareShare
• CollaborateCollaborate
• DiscussDiscuss
• Become involved.....Become involved.....
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Appendix – AcronymsAppendix – Acronyms
• DDI – Data Documentation InitiativeDDI – Data Documentation Initiative• DTD – Document Type DefinitionDTD – Document Type Definition• XML – eXtensible markup languageXML – eXtensible markup language• XSL/XSLT – extensible stylesheet XSL/XSLT – extensible stylesheet
languagelanguage• Template – file containing a set of Template – file containing a set of
chosen tags to be used for each datasetchosen tags to be used for each dataset• Marked-up codebook – all chosen tags Marked-up codebook – all chosen tags
are filled with survey informationare filled with survey information
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The endThe end
Carol Perry & Ernie BoykoCarol Perry & Ernie Boyko