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Problems of Comparability in the German Microcensus Over Time and the New DDI Version 3.0

Presenter 1
Jeanette Bohr
GESIS/ZUMA (Centre for Survey Research and Methodology)
Presenter 2
Andrea Janssen
GESIS/ZUMA (Centre for Survey Research and Methodology)
Presenter 3
Joachim Wackerow
GESIS/ZUMA (Centre for Survey Research and Methodology)

The improvements of the new DDI version 3.0 (Data Documentation Initiative) will make it possible to document the coherences and variations of different census years on the basis of a standardized structure. This concept is realized in DDI 3.0 by the grouping model. The application of the new model will be illustrated by a selected documentation example of the German Microcensus. The Microcensus is a representative annual population sample containing structural population data of 1 percent of all households in Germany. A synoptical table including all variables for selected years shows which variables are comparable over time. This approach facilitates the work with Microcensuses of multiple years. To represent variable inconsistency in DDI, the grouping model offers the possibility to define information as a standard on a top level and to capture variations or additions on a lower level. The presentation will highlight the realization of the grouping model concerning the comparability of variables over time. Opportunities and limitations of documentation with DDI 3.0 will be pointed out and appropriate technical designs will be presented.

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