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{RDF} Data Quality Assessment
Connecting the pieces...
About me...
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●
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●
●
●
Overview
●
●
●
What is
data quality?
What is
??? quality?
Quality of life...
Image credits
Quality of OS
Multidimensional
image credits
Data Quality is
Which one is better?
ex:Foo
a dbo:Person ;
dbo:birthDate ”2000-01-01”^^xsd:date .
ex:Bar
a foaf:Person ;
foaf:age 18 .
ex:Baz
wkd:p31 wk:Q5 ;
wkd:p569 ”2000-01-01”^^xsd:date .
Would you use this information for …
ex:Chickenpox
a ex:InfectiousDisease ;
ex:symptoms ”rash”, “fever”, “headache” ;
ex:treatWithVaccine ex:VaricellaVaccine .
ex:VaricellaVaccine
a ex:Vaccine ;
ex:treats ex:Chickenpox, ex:HerpesZoster .
- a visualization?
- a disease website?
- automated treatment?
Fitness for use
Data Quality is
Data Quality Dimension themes
Accessibility Dimensions
Contextual Dimensions
Intrinsic Dimensions
Representational Dimensions
How good do you need it to get?
Quality Cost ($)
Where things
can go wrong
Where data
can go wrong
Where data can go wrong
birthDate max cardinality 1
birthDate min cardinality 1
dirthDate must be xsd:date
Evolution & quality
↻
↻
↻
↻
↻
↻
See http://aligned-project.eu
Sounds good so
far… now what?
Strategies for managing quality
> Needs good tool support
> Generic tools missing
> Validation engines improved
Validate closer to the source of the error
↻
↻
↻
↻
↻
> Always in the K range
> Scales with source size
> Errors scale as well
Automate, automate & automate...
ex:name
a rdf:Property ;
rdfs:range rdf:langString .
Schema.ttl
ex:Foo
a dbo:Person ;
ex:name “Foo @en” .
Data.ttl
Automate, automate & automate...
ex:name
a rdf:Property ;
rdfs:range rdf:langString .
Schema.ttl
ex:Foo
a dbo:Person ;
ex:name “Foo @en” .
ex:name “Foo”@en .
Data.ttl
CI/CD is your best friend
Recap
Thank you! Questions?
@jimkont
kontokostas.com
slideshare.net/jimkont

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Data quality assessment - connecting the pieces...