1. Statistical Metadata Extensions to the X3.285 Metamodel By Daniel W. Gillman Chairman, NCITS/L8 U.S. Bureau of the Census

2. Introduction l Context –Need –Definitions –Census Bureau –Uses for Statistical Metadata l Extensions l Conclusion

3. Context l Metadata –“Data about Data” –“One Person’s Metadata Is Another’s Data” l Context l Statistics

4. Statistical Data l Microdata –Data about individual objects collected through a survey or experiment. l Macrodata –Data derived through statistical aggregation or other manipulation from microdata or other macrodata.

5. Statistical Metadata l Descriptive information or documentation that facilitates sharing and understanding statistical data over the lifetime of the data. l Includes – file location, record layout, database schemas, data dictionary, definitions, questions, questionnaires, sample design, processing steps, data quality, etc.

6. Census Bureau Metadata Objectives l Gain Acceptance of One Logical Metadata Registry Model l Support wide Range of Projects, Surveys, Applications, and Users l Comply with Federal Standards

7. Purposes of a Statistical Metadata Repository l End-user oriented – Electronic Data Dissemination l Production oriented – Automated Survey Design and Processing

8. Functions of the CMR l Locate Data Sets l Link Common Data Sets l Locate Information About Data Elements l Locate Documentation l Link Common Documents l Link Images

9. Repository Model Overview Registration Metamodel Business Data Documen- tation Data Element

10. Survey Survey Instance Data Sets Questionnaire Questions Products Sample Universe/Frame Business Data Model

11. Administered Component Classification Scheme Common Attributes Objects... Registration Model

12. Administered Component Documentation Documentation Type Documentation Model

13. Conclusion