Frequently Asked Questions

Getting started

• New users
• Accessing IPUMS NHIS data

General information about the project

• About IPUMS NHIS
• Future directions
• Comparing IPUMS NHIS files to NHIS public use files
• Adding value through IPUMS NHIS

Basic concepts

• Microdata
• Integration/Integrated variables
• Weights
• Universe
• NHIS variables not included in IPUMS NHIS
• Combining IPUMS NHIS data with other NHIS data
• Record identifiers

Data limitations and cautions to users

• Major limitations
• User cautions
• Getting help

Getting data

• Obtaining data
• Data formats
• Extract system
• How long does a data extract take?
• Sample selection
• Getting original NHIS data