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Replacing discontinued Big Tech mobility reports: a penetration-based analysis.

Francesco Finazzi1

  • 1Department of Economics, University of Bergamo, Bergamo, Italy. francesco.finazzi@unibg.it.

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New mobility data sets are needed as Big Tech reports are discontinued. An independent analysis shows that even small datasets, with 1 trajectory per 10,000 people, can effectively replace these reports.

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Area of Science:

  • Epidemiology
  • Data Science
  • Public Health

Background:

  • Mobility data was crucial during the COVID-19 pandemic for assessing lockdown impacts and pandemic trends.
  • Key global datasets, Apple's Mobility Trends Reports and Google's Community Mobility Reports, are no longer available or updated.
  • This necessitates the development of new, reliable mobility data products.

Purpose of the Study:

  • To determine the minimum data set penetration required for new mobility products to be comparable to Big Tech reports.
  • To establish a lower bound for data set size that ensures high adherence with existing Big Tech mobility data.

Main Methods:

  • Analysis of an independent mobility dataset comprising 3.8 million smartphone trajectories.
  • Comparison of the information content of this independent dataset with the Google Community Mobility Reports.
  • Calculation of the data set penetration threshold (trajectories per capita).

Main Results:

  • The study identified a lower bound for data set penetration of approximately 10^-4 (1 trajectory per 10,000 people).
  • This penetration level ensures significant adherence and comparability with Big Tech mobility data.
  • Relatively small independent datasets can effectively substitute for discontinued Big Tech mobility reports.

Conclusions:

  • Independent mobility datasets, even those with limited penetration, can provide valuable insights comparable to major Big Tech reports.
  • The findings suggest a viable path for developing new, independent mobility data products for public health and research.
  • This research addresses the gap left by the discontinuation of widely used mobility trend reports.