Google COVID 19 Search Trends symptoms dataset: Anonymization process description

This report describes the aggregation and anonymization process applied to the initial version of COVID-19 Search Trends symptoms dataset, a publicly available dataset that shows aggregated, anonymized trends in Google searches for symptoms (and some related topics). The anonymization process is designed to protect the daily search activity of every user with\varepsilon-differential privacy for\varepsilon= 1.68.