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Discover, Document, and Interoperate

The DDI Alliance is an international membership organization that creates and maintains technical standards for describing research data in the social, demographic, economic, and health sciences. 

We provide a suite of products that address the evolving needs of data producers and users.  Documenting data with our open standards improves consistency, integration, and quality, producing FAIR data, realizing its full potential for people, software, and machines. 

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Why use DDI?

  •  Generate interactive codebooks
  •  Implement data catalogs
  •  Build question banks
  •  Create concordance mappings
  •  Harmonize and compare data
  •  Manage longitudinal data sets
Featured DDI Adopters

The University of Costa Rica and the University of Kansas are collaborating on a project to create a multilingual applied clinical research library (to-date over 400 unique instruments in 850 different applications) that can be shared widely by investigators throughout the US and Latin America to facilitate high-quality biobehavioral research on medical issues germane to Hispanic Americans. Read more...

The Consortium of European Social Science Data Archives (CESSDA) offers a data catalogue providing access to research data from archives across Europe. The catalogue includes nearly 38,000 studies (~29,000 with English descriptions) distributed by members of the CESSDA European Research Infrastructure Consortium (ERIC).  Read more... 

The CLOSER (Cohort and Longitudinal Studies Enhancement Resources) programme aims to maximise the use, value and impact of the member UK longitudinal studies. A key part of the CLOSER project is the creation of a Uniform Search Platform allowing users to search the metadata from all....  Read more... 

An international consortium of more than 750 academic institutions and research organizations, Inter-university Consortium for Political and Social Research (ICPSR) provides leadership and training in data access, curation, and methods of analysis for the social science research community. ICPSR provides all of its metadata records in DDI format. About 75 percent of the holdings also have DDI-compliant variable-level information.   Read more... 

  • Improvement of data collection methods and practices through assessment and improvement of survey methods and programs. The IHSN facilitates the work of experts and specialized task forces who produce guidelines and reference materials..... Read more... 

Midlife in the United States (MIDUS) is a national longitudinal study of health and well-being. It was conceived by a multidisciplinary team of scholars interested in understanding aging as an integrated bio-psycho-social process. Since its inception in 1995 MIDUS has continued to grow, such that it now includes data from over 10,000 individuals, comprising thousands of variables in different scientific areas among distinct cohorts....  Read more... 

The Dataverse Project is a community and an open source web application to share, preserve, cite, explore and analyze research data. It facilitates making data available to others, and allows you to replicate others work. Researchers, data authors, publishers, data distributors, and affiliated institutions all receive appropriate credit....  Read more... 

The VETSA is a nationwide longitudinal project designed to examine genetic and environmental influences on late midlife cognitive and brain changes. Starting in 2002, the baseline VETSA assessment conducted in-person testing of a community-dwelling sample of 1237 male twins ages 51-60 including a five- year follow-up completed in 2013. The project....  Read more... 

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