However, the application of the DDI CVs extends beyond the DDI itself, since such CVs could be used, for instance, to annotate Methods sections in journal articles.Ĭontrolled vocabularies can also be structured, which means that some sort of relationship is established among the terms in the vocabulary. using the same terms to describe the same feature across different datasets. Such controlled vocabularies are particularly useful to describe data consistently, i.e. Screenshot from DDI Controlled Vocabulary for Mode of collection Using such a vocabulary helps avoiding mistakes such as using ‘PAPI’ to refer to self-administered paper questionnaires.įigure 1. It includes an unambiguous ‘Value of the Code’, but also a ‘Descriptive Term of the Code’, alongside a definition. Take for instance the DDI Controlled Vocabulary for Mode of collection: the list represents the most common ways to collect data in the SBE sciences. A Controlled Vocabulary Working Group is in charge of reviewing the comments, additions, and edits proposed by the community. The CVs consist of lists of terms with their definitions. Within the DDI alliance, many controlled vocabularies are being developed to describe the (meta)data. The Data Documentation Initiative (DDI) is an international standard for describing the data produced in the Social, Behavioural and Economic (SBE) Sciences domain. In their non-hierarchical form, whereby no formal relationships are specified among terms, CVs can be used to label digital resources, to facilitate retrieval of said resources, and to filter the results of a search. This additional information is not mandatory, but is helpful for those who want to (re)use the CV.
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