1993-05-13 ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:
- Standardized missing values.
2005-11-04 On 2005-03-14 new files were added to one
or more datasets. These files included additional setup files as well
as one or more of the following: SAS program, SAS transport, SPSS portable,
and Stata system files. The metadata record was revised 2005-11-04 to
reflect these additions.
1998-04-06 Data and documentation for the 1993 wave (Part 7,
Mothers' Interview Data, Part 8, Children's Interview Data, and Part
9, 1985-1993 Child Life History Calendar Data) have been added to this
collection. SAS and SPSS data definition statements for all the
datasets in the collection have also been prepared, and the new
variable FAMID62, which appears as the first variable in each dataset,
can be used to link individual records to form family-level records,
replacing variables formerly used to identify family links
(previously, each wave had a different variable number representing
the 1962 family ID). In addition, OSIRIS dictionaries and frequencies
are no longer available for this collection.