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USING THE ACLD IN TABLEBUILDER
Perturbation of data
To minimise the risk of identifying individuals in aggregate statistics, a technique is used to randomly adjust cell values. This technique is called perturbation. Perturbation involves small random adjustments of the statistics and is considered the most satisfactory technique for avoiding the release of identifiable statistics while maximising the range of information that can be released. These adjustments have a negligible impact on the underlying pattern of the statistics.
The introduction of these random adjustments result in tables not adding up. Randomly adjusted individual cells will be consistent across tables, but the totals in any table may not be the sum of the individual cell values. The size of the difference between summed cells and the relevant total will generally be very small, as demonstrated below.
(Sum of cells = 450,054 + 477,460 = 927,514. Difference of 6 relative to displayed total.)
Some tables generated within TableBuilder may contain a substantial proportion of very low counts within cells (excluding cells that have counts of zero). When this occurs, all values within the table are suppressed in order to preserve confidentiality. The following error message displayed at the bottom of the table indicates when table suppression has occurred.
'ERROR: The table has been suppressed as it is too sparse'.
ACCESS TO TABLEBUILDER
To access the ACLD via TableBuilder, please register or log in, via the Microdata Entry Page. Please familiarise yourself with the Responsible Use of ABS Microdata Guide (cat. no. 1406.0.55.003), if you intend to access ACLD microdata.
These documents will be presented in a new window.
2080.0 - Microdata: Australian Census Longitudinal Dataset, ACLD Quality Declaration
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 20/03/2019