Today I was reading a news story and I noted the data came from Google’s COVID-19 Community Mobility Report The data sets were organized by geographic location and showed the percent change in visits to places like grocery stores and parks. I downloaded the data for Oregon and referenced Multnomah County.
About the data:
These reports show how visits and length of stay at different places change compared to a baseline. We calculate these changes using the same kind of aggregated and anonymized data used to show popular times for places in Google Maps.
Changes for each day are compared to a baseline value for that day of the week:
The baseline is the median value, for the corresponding day of the week, during the 5-week period Jan 3–Feb 6, 2020.
The reports show trends over several weeks with the most recent data representing approximately 2-3 days ago—this is how long it takes to produce the reports.
Note: If the baseline was established in January-February -- a time of cold, wet winter weather in Oregon -- the above graph may represent seasonal visits of parks more than a reaction to COVID.