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nmdefries committed Jan 6, 2025
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9 changes: 6 additions & 3 deletions docs/api/covidcast-signals/nhsn.md
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Expand Up @@ -25,7 +25,8 @@ Each signal below is derived from one of two following datasets:
- Main: [Weekly Hospital Respiratory Data (HRD) Metrics by Jurisdiction, National Healthcare Safety Network (NHSN)](https://data.cdc.gov/Public-Health-Surveillance/Weekly-Hospital-Respiratory-Data-HRD-Metrics-by-Ju/ua7e-t2fy/about_data)
- Preliminary: [Weekly Hospital Respiratory Data (HRD) Metrics by Jurisdiction, National Healthcare Safety Network (NHSN) (Preliminary)](https://data.cdc.gov/Public-Health-Surveillance/Weekly-Hospital-Respiratory-Data-HRD-Metrics-by-Ju/mpgq-jmmr/about_data). Signals derived from the preliminary dataset have suffix `_prelim` in their signal names.

Both datasets started reporting data in late 2022. As of May 2024, NHSN received data from 78% of US EDs.
Both datasets started reporting data in late 2022.
As of May 2024, NHSN received data from 78% of US EDs.

State and nation-level values are pulled directly from the source; HHS-level values are aggregated up from the state level.

Expand All @@ -45,7 +46,8 @@ State and nation-level values are pulled directly from the source; HHS-level val

## Estimation

All data is weekly such that each reported value represents a total from Sunday to Saturday of the reference week. The `output_signal_name` signal mirrors the `input signal name` field for all geographic resolutions except HHS.
All data is weekly such that each reported value represents a total from Sunday to Saturday of the reference week.
The `output_signal_name` signal mirrors the `input signal name` field for all geographic resolutions except HHS.

### Geographic weighting

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## Lag and Backfill

The signals are currently updated weekly, generally on Friday. Each report adds data for the week prior.
The signals are currently updated weekly, generally on Friday.
Each report adds data for the week prior.
For example, on Friday, 2024-04-19, the source added new data representing hospitalizations from the week ending 2024-04-13.
This results in a reporting lag of 6 days from the end of the reference week.

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