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Major Components of the DDI Model. Document Description Study Description File Description Data Description Related Material. DDI Structural Diagram. Section 1: Document Description. Citation – Bibliographic information describing the marked-up document.
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Major Components of the DDI Model • Document Description • Study Description • File Description • Data Description • Related Material
Section 1: Document Description • Citation– Bibliographic information describing the marked-up document. • Guide – Terms and definitions used in the documentation. • Status – Indicator of whether the documentation is a prerelease or final version. • Source – Citation for the source of the marked-up documentation.
Section 3: File Description • Name, contents, structure and dimensions (e.g., number of cases and record lengths) of each file in the collection. • Uses XML ID/IDREF mechanism to indicate which elements in study description apply to particular files
Section 4: Data Description • Variable Group–Groups variables that share a common subject, are coded from a single question, or are linked in some other way. • Variable–Name, weighting, valid/invalid ranges, etc. • Variable Group uses ID/IDREF to indicate which variables are in the grouping.
Section 5: Other Material • Allows for the inclusion of other materials that are related to the study as identified and labeled by the person doing the mark-up (e.g., bibliography, reports, etc.) • A "container" for other machine-readable materials such as data definition statements, PDF or scanned facsimile of the codebook, etc.