case studies: statistics canada (wp 11) alice born [email protected] statistics...
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Case Studies:Statistics Canada (WP 11)
Alice Born [email protected] Statistics Canada
UNECE Workshop on Statistical Metadata
July 4 to 6, 2007
Outline
1. Overview
2. Statistical metadata systems and the statistical cycle
3. Statistical metadata in each phase of the statistical cycle
4. Systems and design issues
5. Organizational and cultural issues
Overview of Integrated Metadatabase (IMDB)
• To support interpretation of the data – dissemination phase
• Responsibility of Standards Division (metadata, classifications and standard definitions)
• Adherence to Policy on Informing Users on Data Quality and Methodology, Policy on Standards and Quality Assurance Framework
• In general, metadata goes back November 2001
Overview of Integrated Metadatabase (IMDB)
• Contains metadata on 350 active and 250 inactive surveys and statistical programs– Purpose– Methodology used to produce the data– Measures of data accuracy– Variables, classifications for the data– Location of clean master datafile – Contacts
• Survey managers cannot release data without the prescribed metadata – mandatory
Overview of Integrated Metadatabase (IMDB)
Next priorities:• Complete documentation of variables• Complete questionnaire model• determine metadata for archived datafiles – may require
additional metadata
Lessons learned:• Opportunities in collecting metadata in the first phase of
the statistical cycle – not at the time of dissemination
Statistical metadata systems and the statistical cycle
Relationship with survey planning and design phase• IMDB expanded its role as part of the Household Survey Content
Harmonization• Standardize concepts, questions, question blocks across household
surveys• Variables follow the ISO-IEC 11179• Questions and question blocks, associated response choices linked
to variables and classifications are stored in the IMDB at the beginning
• Survey Specification Manager pulls metadata from the IMDB but contains specifications and code
Statistical metadata systems and the statistical cycle
Relationship to dissemination systems• Metadata for information modules on the STC website
– mandatory • Information for survey respondents – requires
metadata prior to release of data• Data Liberation Initiative – public-use microdata files
documented in DDI• Metadata to support data exchange – SDMX, DDI,
XBRL, Wiki, HTML, etc….
Statistical metadata systems and the statistical cycle
Relationship to aggregation - analysis phase• Analytical datawarehouses use IMDB to organize their
tables (variables and classifications)
Relationship to archive phase• IMDB contains location of master datafile, record layout,
contact information• Currently developing business rules for archived
datafiles
Statistical metadata systems and the statistical cycle
Relationship with management systems• Software Register – registry of Agency’s software and
applications organized by survey and statistical program – IMDB is the inventory
• Quality management assessment and questionnaire – based on inventory of surveys in the IMDB; reuse of existing metadata
OperationsManagement
QualityAssurance
Analysis Dissemination
Collect Edit Estimate Tabulate Publish
OperationalData
RegistersSurveyData
AdministrativeData
Data Warehouses
Operational Data Stores
IMDB in the survey life cycleIMDB in the survey life cycle
Design
Metadata IMDB
Archive
IMDB
Statistical metadata for phases in the statistical cycle
Metadata describing statistical business processes– Data dissemination for interpretation of data– IMDB serves as the corporate inventory of all
surveys and statistical programs, questionnaires, master datafiles
– metadata or paradata resides in other metainformation systems – SSM, IQMS
Statistical metadata for phases in the statistical cycle
Metadata for data elements– Supports: Survey planning and design; Analysis;
Dissemination; Archiving– Metadata objects tracked over time for changes
(versioning) and validity (registration)– Output to online data tables and STC products– For discovery – inventory of DE on STC website and
STCWiki (internal review before going public)– Links to questions, question blocks, datafiles
STCWiki – Type of marital status of person
Statistical metadata for phases in the statistical cycle
Metadata for survey planning and design– Questions, standard questions blocks and
standard response choices in IMDB– Mapped to value domains, data elements and
surveys in the IMDB– These metadata assembled into collection
instruments in other metainformation systems outside the IMDB
Systems and design issues
• IMDB started in 1998– Phase 1 Consolidation of existing metadata stores– Phase 2 Metadata describing statistical business
processes– Phase 3 Metadata for data elements, etc.
• MetaStat system – Statistical activity, survey, instance, frame, universe, instrument, datafiles, survey methodology, documentation, data accuracy
• MetaWeb system – object class, property, data element, value domain, question, response choices, question block, value meaning manager
Phase 2 Input Screens
Text strings related to data components
Directives Resource Bundle
Key Value
SurveySDDS Statistical Data Doc…… ...
Labels Resource Bundle
Key Value
SurveySDDS SDDS… ...
IMDBdatabase
Phase 2 Input ScreenAdministered Item
Phase 2 - Identification Tab
Systems and design issues
Dissemination and information discovery systems
• Web publication from IMDB is through HTML, dynamically generated with Perl scripts
• Conforms to government standards – CLF• Survey-centric view and developing DE-centric view• Discovery from Wiki solution – non-linear view of Phase
2 and 3 metadata• Allows users to view links among administered items in
the IMDB
Organizational and cultural issues
• Information management• Assist in harmonization / usage of standards• Knowledge sharing• Corporate memory• Reuse of our metainformation assets
Knowledge Sharing/Corporate MemorySurvey Life Cycle
IMDB
Collect Edit Estimate Tabulate PublishDesign
Survey
Universe
Frame
Instance
Collection Instrument
Methodology
Data Files
Enterprise Architecture
Concepts(Object Class, Property,
Data Element Concept)
Data Elements
Questions
Questions Blocks
Classifications(Conceptual Domain
Value Domain)
Corporate MemoryData Files
IMDB
OperationalData
RegistersSurveyData
AdministrativeData
Operational Data Stores
Clean Master File
Public UseMaster File
Archival information
ArchivedData
IMDB
Reuse of Information AssetsInformation Discovery/Dissemination
Wiki
HTML
SDMX
DDI
?
One meta data source
many uses for the information
many output formats
Reuse of Information AssetsApplications Development
IMDB
Classification coding
Collection instrument development
Publishing
Other applications
Reuse of Information AssetsIntegration with Data
IMDBData Warehouses
CANSIM
Organizational and cultural issues
• STC is one of the most integrated statistical systems in the world
• As part of its Enterprise Architecture strategy – moving towards centralized and generalized systems, including the IMDB
• IMDB was built initially to support interpretation of disseminated data
• Pressure is to provide metadata up (and down) the statistical value chain and into management systems
• Opportunities at the Survey planning and design phase – reuse of existing metadata (variables, classifications, questions, etc) registered in the IMDB – coherence