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Copy file name to clipboardExpand all lines: docs/api/covidcast-signals/nhsn.md
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@@ -25,7 +25,8 @@ Each signal below is derived from one of two following datasets:
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- 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)
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- 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.
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Both datasets started reporting data in late 2022. As of May 2024, NHSN received data from 78% of US EDs.
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Both datasets started reporting data in late 2022.
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As of May 2024, NHSN received data from 78% of US EDs.
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State and nation-level values are pulled directly from the source; HHS-level values are aggregated up from the state level.
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## Estimation
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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.
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All data is weekly such that each reported value represents a total from Sunday to Saturday of the reference week.
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The `output_signal_name` signal mirrors the `input signal name` field for all geographic resolutions except HHS.
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### Geographic weighting
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## Lag and Backfill
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The signals are currently updated weekly, generally on Friday. Each report adds data for the week prior.
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The signals are currently updated weekly, generally on Friday.
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Each report adds data for the week prior.
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For example, on Friday, 2024-04-19, the source added new data representing hospitalizations from the week ending 2024-04-13.
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This results in a reporting lag of 6 days from the end of the reference week.
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