Quality Indicator 1: Dates & Times

Datatype overview: date of publication/manufacturing

The following pie charts give an overview of the datatype compatibility for the properties iisg:dateOfPublication and iisg:dateOfManufacturing. They quantify the number of literals for each datatype IRI. The left hand side shows the results for the 2017 version of the IISG Knowledge Graph, while the right hand side shows the results for the 2018-09 version.

Uninterpretable dates: date of publication

The following diagram shows the 100 most common string values for the predicate iisg:dateOfPublication. The diagram shows that cleaning only the 10 most common strings will significantly improve the data quality of this property.

Datatype overview: date of manufacturing

The following pie charts give an overview of the datatype compatibility for the property iisg:dateOfManfacturing. Notice that many values have datatype IRI xsd:string, i.e., cannot be interpreted as dates.

Uninterpretable dates: date of manufacturing

In following table below the first 100 types of misclassified data values are shownfor the predicate iisg:dateOfManufacturing. Changing the first 10 elements will lower the number of misclassifications significantly.