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An additional level (2. All persons in household) was created for processing purposes, including family coding and calculating household income. Data from this level is not available for output.
Most data from the NATSISS is available at the person level and describes personal characteristics, or characteristics of the household to which the person belongs.
The output data file was extensively validated through item-by-item examination of input and output frequencies, checking populations through derivations, internal consistency of items and across levels of the file, data confrontation, etc. Despite these checks, it is possible that some small errors remain undetected on the file.
As a result of the validation processes, some adjustments have been made to data on a record-by-record basis. Changes were done with reference to other information provided by respondents and only to correct clear errors that were not identified during the survey interview, for example, where the reported amount of time lived in previous and/or current dwelling is inconsistent with a person's age. Adjustments may also have occurred as the result of an edit not being applied or being by-passed. For example, where the response to a question was recorded as 'don't know' and was subsequently answered. In cases where the interviewer did not or was unable to return to the original question, the details may have been recorded in a text file.
In general, unless data were 'impossible' they have not been corrected, and results are essentially 'as reported'. To hide 'improbable' responses (eg extremely high alcohol consumption or income) some outliers have been reclassified, primarily to 'not stated' values. Some of these adjustments were made record-by-record; for others a global change was used for all records where reported values lay outside acceptable limits.
Decisions to apply treatments or adjustments to the data were made, as appropriate, by the ABS.
In the final stages of processing, extensive analyses, including data confrontation, were undertaken to ensure the survey estimates conformed to known or expected patterns, and were broadly consistent with data from the 2008 NATSISS or from other ABS data sources, allowing for methodological and other factors which might impact comparability.
Detailed analyses were undertaken for each topic to check for consistency with data from the following sources:
Checks undertaken include:
Data available from the survey are essentially 'as reported' by respondents. The procedures and checks outlined above were designed primarily to minimise errors occurring during processing. In some cases it was possible to correct errors or inconsistencies in the data which was originally recorded in the interview, through reference to other data in the record; in other cases this was not possible and some errors and inconsistencies may remain on the data file.
Published NATSISS data have been subject to perturbation. For more information, see Methodology in this publication. For further details relating to the perturbation of Expanded CURF data, see Using the Expanded CURF in the NATSISS microdata publication.
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