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SCOVO:

Using Statistics on the Web of Data

Michael Hausenblas, Wolfgang Halb, Yves Raimond, Lee Feigenbaum, Danny Ayers

ESWC2009 In-Use Track, 2009-05-04, Heraklion, Greece

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Agenda SCOVO Motivation

Requirements and Issues

Statistical Modelling Framework

Comparison

Usage

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Motivation SCOVO: Statistical Core Vocabulary

http://sw.joanneum.at/scovo

Statistical data is present everywhere

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MotivationWeb of Data is for sharing, accessing and using

DATA

SCOVO aims at makingstatistical data easierand better accessibleon the Web of Data

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MotivationBased on 3 distinct efforts riese – ‚RDFizing and Interlinking the EuroStat Data

Set Effort‘ http://riese.joanneum.at Eurostat data (official European statistics)

US Census Bureau‘s annual Statistical Abstract Publishing UN and OECD

http://oecd.dataincubator.org/

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Issues Handling of Multiple Dimensions Reusability and Uptake Structural vs. Domain Semantics Performance and Scalability Issues

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Requirements Usable on the Web of Data (URIs, RDF, etc.) Extensible both on schema level and instance level Light-weight, addressing uptake, and performance

and scalability issues.

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Statistical Modelling Framework

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SCOVO

http://purl.org/NET/scovo

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Comparison

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Example From http://purl.org/NET/scovo

SELECT ?airport_name ?period ?percent_ontime_arrivals

FROM <http://sw.joanneum.at/scovo/otf-example-full.rdf>

WHERE {

?item rdf:type scv:Item ;

scv:dimension ?airport;

scv:dimension ?time_period;

scv:dimension ex:ota ;

rdf:value ?percent_ontime_arrivals .

?airport rdf:type ex:Airport ;

dc:title ?airport_name .

?time_period rdf:type ex:TimePeriod ;

scv:min ?min ;

scv:max ?max ;

dc:title ?period .

FILTER ( ?min > "2006-02-01" && ?max < "2006-08-01")

}

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Usage: riese

RDFizing and Interlinking the Eurostat data Set Efforthttp://riese.joanneum.at

Contributing to Linking Open Data project Offers linked data version of Eurostat data for both humans and machines (first LOD-in-RDFa

dataset in the cloud)

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Usage: voiD voiD – Vocabulary of Interlinked Datasets

http://semanticweb.org/wiki/VoiD Formal description of linked datasets Uses SCOVO to express stats about triples,

interlinking, resources, etc.

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Usage: RDFStats

http://semwiq.faw.uni- linz.ac.at/node/9

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Conclusion Modeling statistics is a non-trivial task (wide range of

requirements, etc.) SCOVO is usable, generic, simple However, there are issue:

Aggregation Domain semantics

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Let‘s discuss!