An overview of methods for treating selectivity in big data sources

Maciej Beresewicz, Risto Tapio Lehtonen, Fernando Reis, Loredana Di Consiglio, Martin Karlberg

Research output: Book/ReportCommissioned reportProfessional

Abstract

Official statistics is now considering seriously big data as a significant data source for producing statistics. It holds the potential for providing faster, cheaper, more detailed and completely new types of statistics. However, the use of big data brings also several challenges. One of them is the non-probabilistic character of most sources of big data, as very often they were not designed to produce statistics. The resulting selectivity bias is therefore a major concern when using big data. This paper presents a statistical approach to big data, searching for a definition meaningful from the statistical point of view and identifying its main statistical characteristics. It then argues that big data sources share many characteristics with Internet opt-in panel surveys and proposes this as a reference to address selectivity and coverage problems in big data. Coverage and the self-selection process are briefly discussed in mobile network data, Twitter, Google Trends and Wikipedia page views data. An overview of methods which can be used to address selectivity and eliminate, or mitigate, bias is then presented, covering both methods applied at individual level, i.e. at the level of the statistical unit, and at domain level, i.e. at the level of the produced statistics. Finally, the applicability of the methods to the several big data sources is briefly discussed and a framework for adjusting selectivity in big data is proposed.
Original languageEnglish
Place of PublicationLuxembourg
PublisherEuropean Commission
Number of pages111
ISBN (Electronic)978-92-79-88769-7
DOIs
Publication statusPublished - 5 Jul 2018
MoE publication typeD4 Published development or research report or study

Publication series

NameStatistical working papers
PublisherEurostat
ISSN (Electronic)2315-0807

Fields of Science

  • 112 Statistics and probability

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