NCHS Public-use Synthetic Linked Data

Overview

The National Center for Health Statistics (NCHS) links survey data with administrative data from multiple government agencies to create new data resources that help scientists and policymakers answer complex health questions.

Linking two or more data sources also increases the risk of confidential data being identified. Because of this risk, linked data must usually be accessed through the NCHS Research Data Center network.

To make linked data easier to access, NCHS has piloted a project that creates synthetic linked data files. Synthetic data are created using statistical techniques to maintain properties of the original data.

NCHS has created a verification process so that researchers can confirm synthetic data results against the original data.

Synthetic linked 2016 NHCS-NDI data

This synthetic linked file includes selected variables from the 2016 National Hospital Care Survey (NHCS) with selected linked mortality (death) information from the National Death Index (NDI).

Researchers can use the data on this file to study the association between health factors and death.

Verification of synthetic linked NHCS-NDI data results

To request that NCHS verify your synthetic data results, email a completed Template for Requesting Verification Metrics for the Synthetic Linked NHCS-NDI Data to datalinkage@cdc.gov.

Synthetic linked 2018 NHIS-HUD-CMS data

This synthetic linked file includes selected variables from the 2018 National Health Interview Survey (NHIS) with selected linked data from the Centers for Medicare & Medicaid Services (CMS) Medicare health insurance records and participation in the Department of Housing and Urban Development (HUD) federal housing assistance programs.

Researchers can use the data on this file to study the effect of housing assistance on hospitalizations and other types of healthcare use.

Verification of synthetic linked NHIS-HUD-CMS data results

To request that NCHS verify your synthetic data results, email a completed Template for Requesting Verification Metrics for the Synthetic Linked NHIS-HUD-CMS Data to datalinkage@cdc.gov.