Historical documentation

In 2013-14, the NACC Derived Variables Guide was the resource recommended to researchers using the NACC database. In 2015, the Guide was replaced by the more comprehensive Researchers Data Dictionary for the UDS (the UDS-RDD). Nevertheless, we continue to make the UDS2 guide available for researchers who are using NACC data sets that were cut before the introduction of the UDS-RDD.

If you have one of these older data sets and would like to receive an updated version, please submit a new data request, and NACC will contact you within two days.


December 2013 edition of the UDS2 Derived Variables Guide

September 2012 edition of the UDS2 Derived Variables Guide