Field Level Comparison - spreadsheet showing differences between DDI-L 3.3 and DDI-L 4.0
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Background
The vision of DDI has grown over the years from a simple codebook for microdata and aggregate data files, to a model that supports metadata-driven data systems, and then to a suite of products that supports a variety of applications in a broad area of coverage across several related disciplines. This shift in focus reflects changes in the data environment, technology, and user needs over time.
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