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DDI3 metrics

Presenter 1
Claude Gierl
Centre for Longitudinal Studies, Institute of Education
Presenter 2
Jon Johnson
Centre for Longitudinal Studies, Institute of Education

The Centre for Longitudinal Studies (CLS) and the CLOSER (Cohorts and Longitudinal Studies Enhancement Resources) programme are, in the United Kingdom, in the process of translating legacy paper questionnaires to electronic format on a large scale. The ultimate goal of this programme is to gather the metadata of nine birth cohort studies into a joint DDI3 repository for online searching. In order to monitor the progress of this operation we define metrics which reflect the characteristics of the DDI3 schema, more particularly, its heavy reliance on references, whereby, whenever possible, a DDI3 element is defined once and reused by reference wherever it is required. We measure the volume of the metadata ingested with a Cell Count of the DDI3 xml elements produced and the quality of the metadata with the Synaptic Density, the ratio of the DDI3 references over the Cell Count. The Synaptic Density is expected to have a dual role over the course of the ingestion. In the earlier phases, it measures the lack of redundancy and monitors the cleaning and deduplication processes. In the more mature phases of the repository, it is expected to rise again as re-use, derivations and harmonisations gradually interweave and enrich the metadata.

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