Nationwide Inpatient Sample (NIS): Stratified Sample of Hospitals From State Inpatient Databases (SID)
State Inpatient Databases
Image: Numerous small databases.
N = ~ 4K hospitals
~ 32M records
5 NIS Strata
- U.S. Region.
- Teaching Status.
- Bed Size.
An arrow labeled "Stratified Sample of Hospitals" points from the above list to:
Image: One large database.
N = ~ 1K hospitals
~ 8M records
State is not included as a stratum.
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