diff --git a/docs/api/covidcast-signals/safegraph.md b/docs/api/covidcast-signals/safegraph.md index 96cee3f0d..0b6bf58cf 100644 --- a/docs/api/covidcast-signals/safegraph.md +++ b/docs/api/covidcast-signals/safegraph.md @@ -33,6 +33,10 @@ documentation](https://docs.safegraph.com/docs/social-distancing-metrics). | `full_time_work_prop` | The fraction of mobile devices that spent more than 6 hours at a location other than their home during the daytime (SafeGraph's `full_time_work_behavior_devices / device_count`) | | `part_time_work_prop` | The fraction of devices that spent between 3 and 6 hours at a location other than their home during the daytime (SafeGraph's `part_time_work_behavior_devices / device_count`) | | `median_home_dwell_time` | The median time spent at home for all devices at this location for this time period, in minutes | +| `completely_home_prop_7dav` | Offers a 7-day trailing window average of the `completely_home_prop`. | +| `full_time_work_prop_7dav` | Offers a 7-day trailing window average of the`full_time_work_prop`. | +| `part_time_work_prop_7dav` | Offers a 7-day trailing window average of the`part_time_work_prop`.| +| `median_home_dwell_time_7dav` | Offers a 7-day trailing window average of the `median_home_dwell_time`.| After computing each metric on the census block group (CBG) level, we aggregate to the county-level by taking the mean over CBGs in a county to obtain the value @@ -42,6 +46,11 @@ doing so, we make the simplifying assumption that each CBG contributes an iid observation to the county-level distribution. `n` also serves as the sample size. The same method is used for aggregation to states. +SafeGraph's signals measure mobility each day, which causes strong day-of-week effects: +weekends have substantially different values than weekdays. Users interested in long-term +trends, rather than mobility on one specific day, may prefer the `7dav` signals since +averaging over the preceding 7 days removes these day-of-week effects. + ## Lag SafeGraph provides this data with a three-day lag, meaning estimates for a