DDI as Content for Registries

Diffusion Directions Imaging (DDI)

Di usion magnetic resonance imaging (dMRI) is the reference in vivo modality to study the connectivity of the brain white matter. Images obtained through dMRI are indeed related to the probability density function (pdf) of displacement of water molecules subject to restricted di usion in the brain white matter. The knowledge of this di usion pdf is therefore of primary importance. Several metho...

DDI as a Common Format for Export and Import for Statistical Packages

One of the roles the DDI standard can perform is to serve as a medium for the transfer of metadata and data across both space and time. A crucial component of this role is the ability to represent the data and metadata contained in common data analysis and management packages. This paper describes an experiment using the program Stat/Transfer to move datasets among five popular packages with DD...

The DDI Approach to Morphology

DDI stands for “Don’t Do It.” White (1980) used the acronym DDI in a delightful paper on garbage collection. He argued 25 years ago that the garbage collector should be run rarely – perhaps once a year – if at all. That’s pretty much how many of us work these days. We buy enough memory so we don’t have to clean up more than once a week. Rebooting is easier than garbage collecting. As for disks,...

Locating the Geographic Center of DDI 3.0

DDI Tools Catalogue: A Sharing Platform for Everyone

Andias Wira-Alam, GESIS, Germany Katherine McNeill, MIT, USA Jannik Jensen, Danish Data Archive, Denmark Sunny Kaniyathu, University of Saskatchewan, Canada David Schiller, Institute for Employment Research, Germany Abstract In recent years the use of the Data Documentation Initiative (DDI) metadata formats has spread across research communities. To date, many DDI developers from different coun...