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asbigas DDI-L?
Disco Spechttps://github.com/linked-statistics/ disco-spec/blob/master/discovery.html
Triple Storehttp://multiweb.gesis.org/openrdf- workbench/repositories/discotest/summary
Why Disco?
Why DDI as Linked Data?
Use Case
Whereto searchfor data?
Which microdatadoes existaccording to specific metadata?
Which datasetsare associatedwith the microdata?
Which aggregated data according to specific metadatadoes exist?
Which datasetsare associatedwith aggregated data?
Fromwhich microdatadatasets is the aggregateddataset derived?
Whichsummary statisticsdoes a variablehave?
Which category statistics does a variablerepresentation have?
Which microdata datasetsare created bythe research institute 'GESIS'?
Overview
SeriesStudies
Series 
Series title: CIS
Study 
Study title: EU-LFS 1991
Agents
IdentificationVersioning
ddi:study 
a disco:Study; 
dcterms:title 
"National Population and 
Housing Census, 1980"@en; 
adms:identifier[ 
a adms:Identifier; 
skos:notation 
"us:ddi:us.mpc:ARG_1980_PHC_v01_A_IPUMS:1"; 
adms:schemaAgency "DDI Alliance"@en. 
].
ddi:study 
a disco:Study ; 
dcterms:creator [ 
rdfs:label 
"Minnesota Population Center"@en ; 
skos:notation "MPC“ ; 
adms:identifier[ 
a adms:Identifier ; 
skos:notation "us.mpc“ ; 
adms:schemaAgency 
"DDI Alliance"@en] ] .
Coverage
Spatial Coverage
<urn:ddi:de.gesis:study_EU-SILC-2005:0.1> 
a disco:Study ; 
dcterms:title 
"EU-SILC 2005"@en ; 
skos:prefLabel "2005"@en ; 
dcterms:spatial 
<http://sws.geonames.org/2782113> , 
... , 
:AllCountriesOfStudy ;
:AllCountriesOfStudy 
a dcterms:Location, 
missy:Country; 
rdfs:label 
"all countries of study"; 
missy:code "" .
Countries 
Study: EU-LFS 2004
Temporal Coverage
<urn:ddi:de.gesis:study_EU-SILC-2005:0.1> 
a disco:Study ; 
dcterms:title "EU-SILC 2005"@en ; 
skos:prefLabel "2005"@en ; 
dcterms:temporal 
<urn:ddi:de.gesis:0ba9b4f3-ec22- 4471-8ffa-a38e8ada187a:0.1> ;
<urn:ddi:de.gesis:0ba9b4f3-ec22-4471- 8ffa-a38e8ada187a:0.1> 
a disco:PeriodOfTime; 
dcterms:date 
"Jan 1, 2005 12:00:00 AM"^^xsd:date .
Year 
Study title: 
'Structure of Earnings Survey –2006'
Topical Coverage
missy:PB100 
a disco:Variable 
dcterms:subject[ 
a skos:Concept ; 
skos:notation 
"Quarter of the personal 
interview"@en ] .
Topical Coverage 
Variable ID: 
<urn:ddi:de.gesis:variable_EU-SILC-2010- panel-p-data-2010_rev2-PB020:0.1> 
Variable name: 
'PB020'
Thematic Classification
:thematicClassification 
a skos:ConceptScheme; 
skos:hasTopConcept 
:concept1 , 
:concept2 , 
:concept3 . 
Series-Level
:superConcept 
a skos:Concept ; 
skos:notation 
"Demographic background"@en ; 
skos:narrower 
:subConcept1 , 
:subConcept2 . 
Narrower Concepts
Direct Broader Concepts 
Concept: 
'Country'@en
All (Direct + Indirect) Broader Concepts 
Concept: 
'Country'@en
Direct Narrower Concepts 
Concept: "Type of cooperation"@en
All (Direct + Indirect) Narrower Concepts 
Concept: "Type of cooperation"@en
Top Concepts 
Series: EU-SILC 
Thematic Classification: 
<urn:ddi:de.gesis:7bb54a91-4b26-4f6e- a1b7-be48cb58be24:0.1>
2-Level Concepts 
Series: EU-SILC 
Thematic Classification: 
<urn:ddi:de.gesis:7bb54a91-4b26-4f6e- a1b7-be48cb58be24:0.1>
Lowest-Level Concepts (Leaf Concepts) 
Series: EU-SILC 
Thematic Classification: 
<urn:ddi:de.gesis:7bb54a91-4b26-4f6e- a1b7-be48cb58be24:0.1>
Data SetsData Files
Data Sets
All Data Sets (IDs) 
Study: EU-SILC 2010
Data Files
:dataFile 
a disco:Datafile; 
dcterms:identifier 
"ARG1900-P-H.dat“ ; 
dcterms:description 
"Person records"@en ; 
disco:caseQuantity 2667714 ; 
dcterms:format "ascii“ ; 
dcterms:provenance 
"Minnesota Population Center"@en ; 
owl:versionInfo 
"Version 1.0, IPUMS sample"@en.
:dataFile 
a disco:Datafile ; 
dcterms:spatial[ 
a dcterms:Location ; 
rdfs:label 
"Argentina, national coverage"@en]; 
dcterms:temporal:periodOfTime .
Controlled Vocabularies
Variables
ddi:AR80A401 
a disco:Variable; 
skos:notation "AR80A401“ ; 
skos:prefLabel "Sex"@en ; 
disco:basedOn ddi:SexVD ; 
disco:question ddi:QuestionGender .
ddi:SexVD 
a disco:RepresentedVariable; 
disco:universe ddi:UniversePerson ; 
disco:representation ddi:SexRepr ; 
disco:concept ddi:IpumsC1 ; 
skos:prefLabel "Sex"@en ; 
dcterms:description 
"Sex data element"@en.
missy:PB100 
a disco:Variable; 
skos:notation "PB100" ; skos:prefLabel 
"Quarter of the personal 
interview"@en ; 
skos:concept :concept ; 
disco:question :question .
Variables (Names + Labels) 
Data Set: 
EI-SILC 2010 cross-sec p-data 
Data Set (ID): 
<urn:ddi:de.gesis:logicalDataSet_EU-SILC- 2010-cross-sec-p-data-2010_rev3:0.1>
Variable Concept 
Data Set: 
EI-SILC 2010 cross-sec p-data 
Data Set (ID): 
<urn:ddi:de.gesis:logicalDataSet_EU-SILC- 2010-cross-sec-p-data-2010_rev3:0.1> 
Variable Name: 
PB010
Study 
Data Set 
Variable label 
Variable name: 'AGE'
Topical Coverage 
Variable name: 
B21 
Study: 
"Structure of Earnings Survey -2006"@en
Variables having no concepts 
Study title: 
EU-SILC 2006
VariableRepresentation
Valid Codes and Categories 
missy:1 
a skos:Concept; 
skos:notation "1" ; 
skos:prefLabel 
"January,February,March" ; 
disco:isValid true .
Invalid Codes and Categories 
missy:Missing 
a skos:Concept ; 
skos:notation "M" ; 
skos:prefLabel "Missing" ; 
disco:isValidfalse .
Variable -Variable Representation 
missy:PB100 
a disco:Variable , 
missy:Variable ; 
skos:notation 'PB100' ; 
disco:representation 
:representationPB100 .
Variable Representation 
:representationPB100 
a disco:Representation, 
skos:OrderedCollection; 
skos:memberList ( 
missy:1 
missy:2 
missy:3 
missy:4 
missy:Missing ) .
Variable Representation 
Codes and Categories 
Variable: 
missy:PB100
Descriptive Statistics
Summary Statistics
missy:Minimum 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:Minimum ; 
rdf:value "1".
Spatial Coverage of Study 
:AllCountriesOfStudy 
a dcterms:Location, 
missy:Country; 
rdfs:label 
"all countries of study"; 
missy:code "" .
missy:Minimum 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
<http://sws.geonames.org/2921044> ; 
disco:summaryStatisticType 
ddicv-sumstats:Minimum ; 
rdf:value "1".
missy:Maximum 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:Maximum ; 
rdf:value "4".
missy:Mean 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:ArithmeticMean ; 
rdf:value "2.17".
missy:StandardDeviation 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:StandardDeviation ; 
rdf:value "0.9061".
missy:ValidCases 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:ValidCases ; 
rdf:value "470950".
missy:PercentOfValidCases 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; 
disco:summaryStatisticType 
ddicv-sumstats:PercentOfValidCases ; 
rdf:value "99.1".
missy:InvalidCases 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:InvalidCases ; 
rdf:value "4195".
missy:PercentOfInvalidCases 
a disco:SummaryStatistics , 
missy:SummaryStatistics; 
disco:statisticsVariable 
missy:PB100 ; 
missy:country 
:AllCountriesOfStudy ; disco:summaryStatisticType 
ddicv-sumstats:ValidCases ; 
rdf:value "0.9".
Variable Pointing to Summary Statistics 
missy:PB100 
a disco:variable , 
missy:Variable ; 
missy:summaryStatistics( 
missy:Minimum 
missy:Minimum_DE 
missy:Maximum 
missy:Maximum_DE 
… )
Summary Statistics: Minimum 
Variable: 
missy:PB100 
Spatial Coverage: 
all countries of study
Summary Statistics: Valid Cases 
Variable: 
missy:PB100 
Spatial Coverage: DE
Category Statistics
Valid Codes and Categories 
missy:2 
a skos:Concept , missy:Concept ; 
skos:notation "2" ; 
skos:prefLabel 
"April, May, June" ; 
disco:isValid true ; 
missy:categoryStatistics( 
missy:CS_2_AllCountries 
missy:CS_2_DE ) .
Invalid Codes and Categories 
missy:Missing 
a skos:Concept , missy:Concept ; 
skos:notation "M" ; 
skos:prefLabel "Missing" ; 
disco:isValid false ; 
missy:categoryStatistics ( 
missy:CS_M_AllCountries ) .
Valid Cases 
missy:CS_2_AllCountries 
a disco:CategoryStatistics, 
missy:CategoryStatistics ; 
disco:statisticsCategory missy:2 ; 
missy:country 
:AllCountriesOfStudy ; 
disco:frequency 243708 ; 
disco:percentage 51.3 ; 
disco:cumulativePercentage 51.7 ; 
disco:computationBase "valid" .
Invalid Cases 
missy:CS_M_AllCountries 
a disco:CategoryStatistics, 
missy:CategoryStatistics ; 
disco:statisticsCategory 
missy:Missing ; 
missy:country 
:AllCountriesOfStudy ; 
disco:frequency 4195 ; 
disco:percentage 0.9 ; 
disco:computationBase "invalid" .
Category Statistics: 
Frequency ( Invalid Cases) 
Variable: missy:PB100 
Spatial Coverage: All Countries of Study 
Code: missy:Missing
Category Statistics: 
Cumulative Percentage ( Valid Cases) 
Variable: missy:PB100 
Spatial Coverage: DE 
<http://sws.geonames.org/2921044> 
Code: missy:2 
Category Label: 'April, May, June'
Data Collection
:variableYearOfBirth 
a disco:Variable 
skos:notation "RB080" ; skos:prefLabel "Year of birth"@en ; dcterms:subject :concept ; disco:question:questionYearOfBirth.
:questionYearOfBirth 
a disco:Question; 
disco:questionText 
"What is your date of birth?"@en .
Variable Question 
Data Set: 
EI-SILC 2010 cross-sec p-data 
Data Set (ID): 
<urn:ddi:de.gesis:logicalDataSet_EU-SILC- 2010-cross-sec-p-data-2010_rev3:0.1> 
Variable Name: 
PB010
Variables 
Series: 
EU-SILC 2005 
Question text: 
'What is your date of birth?'@en
Relationships to other Vocabularies
PHDD
Mapping DDI-XML to Disco
DDI 4
DDI 4 
•Model-driven further development of DDI 
•Model generate multiple representations(OWL, XSD, Java, RDB, …) 
•Functional views are published in a step by step manner
Disco + DDI 4
Do Not Wait for DDI 4! 
•Own functional view for disco 
•Mapping: disco DDI 4 (OWL representation) 
•Easy migration
Let‘s Disco Now!
Acknowledgements 
26expertsfromthestatisticalcommunityandtheLinkedDatacommunitycomingfrom12differentcountriescontributedtothiswork.Theywereparticipatingintheeventsmentionedbelow. 
•1stworkshopon'SemanticStatisticsforSocial,Behavioural,andEconomicSciences:LeveragingtheDDIModelfortheLinkedDataWeb'atSchlossDagstuhl-LeibnizCenterforInformatics,GermanyinSeptember2011 
•Workingmeetinginthecourseofthe3rdAnnualEuropeanDDIUsersGroupMeeting(EDDI11)inGothenburg,SwedeninDecember2011 
•2ndworkshopon'SemanticStatisticsforSocial,Behavioural,andEconomicSciences:LeveragingtheDDIModelfortheLinkedDataWeb'atSchlossDagstuhl-LeibnizCenterforInformatics,GermanyinOctober2012 
•WorkingmeetingatGESIS-LeibnizInstitutefortheSocialSciencesinMannheim,GermanyinFebruary2013

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