Study Number 6513 - Road Accident Data, 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�30 + 10% 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
The documentation has not changed since 2007.
As previously noted with the 2008 study, in this 2009 study the variable v2_16 (1st Point of Impact) in the Vehicle file (veh09) contains 3 unlabelled values of 9.
Data conversion information
From January 2003 onwards, almost all data conversions have been performed
using software developed by the UKDA. 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 Stat/Transfer
command processors to perform certain format translations. Although data
conversion is automated, all data files are also subject to visual inspection by
a UKDA data processing officer.
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 UKDA Data Dictionary file (in rich text
format), corresponding to each data file, is usually provided for viewing and
searching 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 format in which you have
been supplied the data. Some of this information is specific to the ingest
of the data, that is the format in which the UKDA was supplied the
data in. The ingest format for this study was
Fixed width text
Please click below to find out information about the format that you have
been supplied the data in
Tab-delimited text (*.tab)
MS Excel (*.xls files)
SAS (supplied as *.dat and *.sas)
MS Access (*.mdb files)
Conversion of documentation formats
Electronic and paper documentation supplied with this study is usually
incorporated into the UKDA User Guide (in PDF format). The conversion programmes
used are the latest versions of Adobe PDF Writer for electronic documentation
and Adobe Paper Capture (Acrobat 'plugin' version) for paper documentation.
Occasionally, some�of the electronic documentation cannot be usefully converted
to PDF (e.g. MS Excel files with wide worksheets) and this is supplied in�a more
appropriate format. All User Guides are fully bookmarked.