Study Number 6853 - Young Lives: an International Study of Childhood Poverty: Round 3, 2009
DATA PROCESSING NOTES
Data Archive Processing Standards
The data were processed to the UK Data Archive's B standard. A substantial series of checks was carried out to ensure the quality of the data and documentation. Firstly, checks were made that the number of cases and variables matched the depositor's records. Secondly, logical checks were performed on a sample of the remaining nominal (categorical) variables to ensure they had values within the range defined (either by value labels or in the depositor's documentation). Thirdly, any data or documentation that breached confidentiality rules were altered or suppressed to preserve anonymity.
All notable and/or outstanding problems discovered are detailed under the 'Data
and documentation problems' heading below.
Data and documentation problems
Some variables have been removed for confidentiality purposes but may still be mentioned in the documentation.
This study includes data and documentation for Round 3 only. Round 1 is available under SN 5307 and Round 2 is available under SN 6852.
Disclaimer - Test Scores
The individual scores for the tests are presented in three ways: raw scores corrected for any test administration, raw and Rasch scores where some items have been eliminated due to poor reliability or apparent bias. However, the latter two scores are only preliminary. The Young Lives team is preparing a technical document that will verify these scores, which should be released by early 2012, at which time they may change the scores for children.
Data conversion information
From January 2003 onwards, almost all data conversions have been performed using software developed by the UK Data Archive. This enables standardisation of the conversion methods and ensures optimal data quality. In addition to its own data processing/conversion code, this software uses the SPSS and StatTransfer command processors to perform certain format translations. Although data conversion is automated, all data files are also subject to visual inspection by a member of the Archive�s Data Services team.
With some format conversions, data, and more especially internal metadata (i.e. variable labels, value labels, missing value definitions, data type information), will inevitably be lost or truncated owing to the differential limits of the proprietary formats. A UK Data Archive Data Dictionary file (generally in Rich Text Format (RTF)) is usually provided for each data file, enabling viewing and searching of the internal metadata as it existed in the originating format. These
files are called:
[data file name]_UKDA_Data_Dictionary.rtf
Important information about the data format supplied
The links below provide important information about the Archive's data
supply formats. Some of this information is specific to the ingest
of the data, i.e. the format in which the Archive received the data
from the depositor. The ingest format for this study was
Please follow the appropriate link below to see information on your chosen supply (download)
Tab-delimited text (*.tab)
MS Excel (*.xls/*.xslx)
SAS (*.sas7bdat and *.sas)
MS Access (*.mdb/*.mdbx)
Conversion of documentation formats
The documentation supplied with Archive studies is usually converted to Adobe Portable Document Format (PDF), with documents bookmarked to aid navigation. The vast majority of PDF files are generated from MS Word, RTF, Excel or plain text (.txt) source files, though PDF documentation for older studies in the collection may have been created from scanned paper documents. Occasionally, some documentation cannot be usefully converted to PDF (e.g. MS Excel files with wide worksheets) and this is usually supplied in the original or a more appropriate format.