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54. For the integration of Big Data sources in the statistical production, several initiatives at international level have stated the potential of these new data sources, as well as the quality issues related to several aspects. Firstly, the change of paradigm imposed by the new sources, compared to the traditional sample surveys, moves attention from the well-studied sampling errors to the non-sampling errors, so the population coverage and the self-selectivity of the observations become the most recognized and investigated issues. A general framework for assessing the Quality of Big Data has been prepared by the HLG-MOS Big Data project.
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