AHEAD 1995 Imputation Release (Version 3.0)
December 13, 2002
The AHEAD 1995 Imputation Data Release (Version 3.0) is now available. This release supersedes the previous release (Version 2.0, July 2002) of this data. It corrects modest errors in the annualized values of some variables in Section J due to ignoring the spread of data collection across two calendar years, and more substantial errors to the Social Security income variables due to a difference in reporting periods between the actual values and the bracket values (monthly vs annual). This has a substantial impact on the constructed variable "total household income in the last calendar year" (DHHINC). Anyone using the household income variable should replace it with this new version.
Please note that although the most extreme outliers were excluded from the imputation process used to fill missing data, they remain in the reported data. Users may wish to review distributions and consider the use of robust statistical procedures to minimize the impact of any outliers on their analyses.
If you find any problems with the data, please report them to us via the Help Desk, or by sending e-mail directly to firstname.lastname@example.org.