Home > Data Services > Catalog . Restricted Data . Census . ACS

Search Data Services

Meta Search
search across all the following databases:

Data Catalog
Data and documentation

Common questions and answers.

Entire collection of data resources.

Latest Data News

RSS Feed icon

U.S. Department of Education Releases College Scorecard Data

Big changes coming to IRBs . . . . still time to comment

Will this be an election issue in the US?

U.S. and World Population Clock Has Been Updated with New Features

2013 Income, Poverty, and Health Insurance data

Data Services Knowledge Base


Has anyone combined the 1999-2002 data with the 2003-2004 NHANES data?

I'm using the 4yr weights for the 99-02 but I'm not sure what to do with the 2yr weights on the 2003-2004 data - there don't appear to be updates with 6yr weights. How do I handle the weights when combining 03-04 with the earlier data?


This document on the NCHS website tells you how to create a 6-year weight:


For an estimate of the 6-year 1999-2004, a 6-year weight variable can be created by taking 2/3 of the 4 year weight for each sampled person in 1999-2002 and 1/3 of the 2 year weight for each sampled person in 2003-04.

The document doesn't have page numbers, but this is towards the end of it (~15 page document).

NCHS has created a tutorial for using the NHANES data, which you might find useful:


Annotated Resources:

Direct Links:

Related Question Groups: