Hi everyone,

This is to announce that over the past month we started to look at ways to help us all get a better understanding of the quality of Wikidata's data in a specific area of interest. For this purpose we worked on building two tools; an Item Quality Evaluator and a Constraint Violation Checker  - both of these tools are now available at:

Data quality on Wikidata has many aspects. The constraint violations and ORES quality scores that these tools use are two helpful indicators of certain aspects of quality that we hope will be helpful for you.

As you may know, Wikidata’s data quality is very unevenly distributed - some areas are very well maintained and others not so much. We only currently provide ORES quality scores on a global and per-Item level. This has two effects, however:

To address this issue we put together two small tools. The Item Quality Evaluator is a simple website that provides ORES quality scores for a list of Items in Wikidata. The Constraint Violation Checker is a small command-line script that retrieves the number of constraint violations and ORES scores for a list of Items for further analysis.

How does the Item Quality Evaluator tool work?

You provide it with a list of Item IDs or a SPARQL query and then it'll get the ORES score for each of them as well as the average score over all the Items you

provided in a nice webpage. This way, you can more easily identify the Items in an area you are interested in that have the lowest quality and improve them. 

How does the Constraint Violation Checker script work?

When you run it, it outputs a CSV file with the number of statements, the number of constraint violations for each severity level, the number of sitelinks to all projects and to Wikipedia and the ORES score for each of those Items.

Why didn't we integrate the constraint violations data into the Item Quality Evaluator?

We want to do that in the long-term but right now it is not possible because the constraint violation data is not easily accessible and retrieving it takes several hours to run for a large list of items.

Please try these tools and let us know if you encounter any issues. If you want to provide general feedback, feel free to let us know.


Mohammed Sadat
Community Communications Manager for Wikidata/Wikibase

Wikimedia Deutschland e. V. | Tempelhofer Ufer 23-24 | 10963 Berlin
Phone: +49 (0)30 219 158 26-0

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