Is Your Data Facility ISO Compliant Progress Towards Harmonizing the DDI and ISOIEC 11179 by malj

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									Is Your Data Facility ISO Compliant?
Progress Towards Harmonizing the DDI and ISO/IEC 11179

Dan Gillman Information Scientist US Bureau of Labor Statistics

Introduction
• WebDAIS • ISO/IEC 11179
– Core Model – Registration

• Differences between DDI, DAIS, 11179 • WebDAIS model

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WebDAIS Harmonization
• Health Canada • NESSTAR
• WebDAIS system
– Harmonization of DDI, ISO/IEC 11179, DAIS

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WebDAIS Harmonization
ISO/IEC 11179

WebDAIS DDI

DAIS
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WebDAIS Harmonization

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ISO/IEC 11179
• 6 Part International Standard • Under revision
– Old - Specification and standardization of data elements – New - Metadata registries

• All freely available at ISO web site
– www.iso.ch
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ISO/IEC 11179 - Core Model
Data Element Concept Conceptual Domain

Conceptual Representational
Data Element
Value Domain

Variables
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Values
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ISO/IEC 11179 - Core Model
• Permissible Value
– A value and the value meaning

• Value Domain
– A set of permissible values

• Conceptual Domain
– A set of value meanings

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ISO/IEC 11179 - Core Model
• Object Class (i.e., population)
– A set of objects on which observations are taken

• Property (i.e., characteristic)
– A feature that describes or distinguishes objects

• Data Element Concept
– The concept formed by Object Class + Property

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ISO/IEC 11179 - Core Model
• Data Element
– Association of a DEC and a VD

• Examples

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ISO/IEC 11179 - Core Model
• Two Data Element Concepts
– DEC 1 – Object Class -- Employees of BLS – Property -- Marital Status – DEC 2 – Object Class -- Adult Residents of Ontario – Property -- Marital Status
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ISO/IEC 11179 - Core Model
• Two Value Domains - Marital Status Codes •
– – – –

MSC 1
M; S; D; W; Married Never Married Divorced Widowed M; S;

MSC 2
Married Not Married

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ISO/IEC 11179 - Core Model
Data Elements - 4 Possibilities
DEC --> Emp-MS Res-MS

DE -->

VD -->

MSC 1

MSC 2

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ISO/IEC 11179 - Core Model
• Model Rules and Constraints
– Many DEs may use the same DEC – Many DEs may use the same VD

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ISO/IEC 11179 - Registration and Administration
• Registration – Registration is the process whereby unambiguous identifiers are formally associated with objects.

• Administration – Manages life-cycle of descriptions
• Administration records

– Monitors quality of metadata
• Registration status

– Applies to scope of registry, not just core model
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Differences between DDI, DAIS, and ISO/IEC 11179
• DDI
– – – – – – Subject matter specific End user perspective - “Metadata after the data” XML DTD - not UML model Data set oriented Document oriented - codebook “Study” is highest level of abstraction
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Differences between DDI, DAIS, and ISO/IEC 11179
• ISO/IEC 11179
– – – – – – Independent of particular subject matter Producer perspective - “Metadata before the data” UML model Data and database oriented “Concept” is highest level of abstraction “Administration” is highest level of function
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Differences between DDI, DAIS, and ISO/IEC 11179
• DAIS
– Concept of variable group
• Not a DEC • May be added to ISO/IEC 11179

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WebDAIS Model
• Imported from ISO/IEC 11179
– Administration functions
• WebDAIS will act as a registry

– Concept management (DEC and CD)
• Enables harmonization of data

• Future
– Build model for DDI – Harmonize with ISO/IEC 11179
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Contact
Dan Gillman Gillman.Daniel@BLS.Gov +1.202.691.7523


								
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