We published our mobility time series analysis update and the latest mobility index of Tokyo here;
Mobility Changes in Tokyo
One of the difficulties in dealing with COVID-19 is the approximate 12-day delay between an infection and its registration in the official statistics of confirmed cases. We explored human mobility via mobile phone data as an early indicator of confirmed cases. We analyzed NTT DoCoMo data and accessed high-resolution hourly population data (Mobile Kukan Toukei™) within Tokyo. Our preliminary analysis suggests that the mobility level correlates with the daily growth rate of reported confirmed cases within the following 12 days. We are studying the detailed structure of this correlation by looking at demography, time, and area. Stay tuned for more updates.