« Variables System the bridge between metadata and dissemination Monica Isfan Statistics Portugal 9 –11July 2008

 Variables System  Statistical Indicators  Register flow  Transmission and visualization  Benefits Overview

Variables System ISO/ IEC  Statistical Survey Design  Automatic Questionnaire Generations  Statistical Dissemination  Facilitate Standardization  Identify Duplicates  Facilitate Data Sharing

Variables System Production System Dissemination System

DDD Dissemination Data Base  Central data base of statistical indicators  Inputs → aggregate data from Production Departments  Outputs → aggregate data and the associated metadata

Variables System Property Object class (population or statistical unit) Representation class Value domain Variables Statistical indicators Variables System defined

Statistical Indicators - Definition Data element that represents statistical data for a specified time, place, and other characteristics. (“Terminology on Statistical Metadata, Conference of European Statisticians – Statistical Standards and Studies – Nº 53”). Statistical Indicator

Statistical Indicators - Definition In Variables System Statistical indicator defined Variables Aggregate VariablesDimensions +  D1 = Time  D2 = Geography  …….  Dn = Other characteristics

Aggregate Variables  Property;  Object class = Population;  Representation class = Quantity, Ratio, Value, etc.  Value domain = Non-enumerated + Unit of measure;  Definition and/ or concept;  Formula.

Property = Resident Population Population = Resident Population Representation class = Quantity Value domain = (0, ∞)/ U.M. = No. Concept = Resident population (208/ ) The persons who regardless of the fact that at the moment of observation ' 0:00 a.m. of the reference day ' are present or absent in a given housing unit, this unit being where they live during most of the year with their family, or where they have all or most of their belongings. Formula = No

Statistical Indicators - Definition In Variables System Statistical indicator defined Variables Aggregate VariablesDimensions +  D1 = Time  D2 = Geography  …….  Dn = Other characteristics

Dimensions  Property;  Object class = Statistical Unit;  Representation class = Code;  Value domain = Classification + Level of classification;  Definition and/ or concept.

Property = Sex Statistical unit = Person Representation class = Code Value domain = V00305 – Sex (Dissemination MF) + Level 2 LevelCodeName 1TMF 21M 22F Definition Biological difference between male and female.

Statistical Indicators - Name Aggregate variable D2 = Dimension (geography) Dn = Other dimensions, by and …, Dn-1 = Other dimensions Name definition

Sex Statistical Indicators - Name Aggregate variable Dimension (geography) Other dimensions Resident population Place of residence, by and Age group

Statistical Indicators – Register flow Step 1. Analyse of data and metadata Step 2. Variables and statistical indicators proposal Step 3. Register and approval of variables

 Analyse/ Search  Proposal  Update  Approve Associated Systems  Concepts  Sources Assistant Entities  Property  Object class  Representation class  Value domain  Greatness/ Unit  Administrative sources  Other sources  Files / Version  Conceptual variable  Variable User management End Select type of source Survey Select variables All...Variables for association Select Methodological Document Annual estimates of resident population (version 1) Word Association between variables and the methodological document Aggregate DerivateObservationDimension Step 4. Source selection Resident population 3174| >> Distribution of the resident population (%) 259| >>Resident population (No.) Step 5. Association of aggregate variables Statistical Indicators – Register flow

Assistant Entities  Property  Object class  Representation class  Value domain  Greatness/ Unit  Administrative sources  Other sources  Files / Version  Conceptual variable  Variable User management End Select variables age Association between variables and the methodological document ObservationDerivateAggregate Dimension Statistical Indicators – Register flow Select aggregate variableCross ref. 259| >>Resident population (No.) 190| >> Reference period 235| >> Place of residence 310| >> Sex Generate name Step 6. Define the cross reference 190| >> Reference period 235| >> Place of residence 310| >> Sex Word Variables for association Step 7. Associate the dimensions to the selected aggregate variable All...

Statistical Indicators – Register flow 259| >>Resident population (No.) Cross reference 190| >> Reference period 235| >> Place of residence 310| >> Sex 236| >> Age group (by life cycles) Generate statistical indicator Select aggregate variable Cross reference code: Definition: Name: Registry População residente (N.º)_Período de referência_Local de residência_Sexo_Grupo etário (por ciclos de vida) População residente (N.º) por Local de residência, Sexo e Grupo etário (por ciclos de vida) Resident population (No.) by Place of residence, Sex and Age group ( by life cycle) Step 8. Generate the definition and the name of statistical indicator and execute the registry

Variables System Statistical Indicators (view) Metadata DataWarehouse Data Base Statistical Indicators DB Metadata Data Internet Statistical Indicators – Transmission

Statistical Indicators – Visualization

NameResident population (No.) by Place of residence, Sex and Age group (by life cycles) RegularityAnnual SourceStatistics Portugal, Annual estimates of resident population First available period2000 Last available period2007 Dimensions Dimension 1Data reference period Dimension 2Place of residence Dimension 3Sex Dimension 4Age group (by life cycles) Concepts RESIDENT POPULATIONThe persons who regardless of the fact that at the moment of observation ' 0:00 a.m. of the reference day ' are present or absent in a given housing unit, this unit being where they live during most of the year with their family, or where they have all or most of their belongings. REFERENCE PERIODThe length of time for which data are collected, e.g. a specific day, month or year. AGE GROUPThe age interval in years to which a person belongs at the time of reference. Definition FormulaEstimated value (Dem.) Measure unit (symbol)Number (No.) Power of 100 Last update date29-May-2008

Resident population (No.) by place of residence (NUTS – III) 2007 Statistical Indicators – Visualization

Benefits “Metadata is the key to ensure that information will survive and continue to be accessible into the future.” “Only used statistical information is useful statistical information.”  Central reference for aggregate data and metadata;  Improving communication and understandability;  Increasing data and metadata sharing.

Thank you for your attention! Variables System the bridge between metadata and dissemination