4430.0.30.002 - Microdata: Disability, Ageing and Carers, Australia, 2018 Quality Declaration 
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 10/03/2020   
   Page tools: Print Print Page Print all pages in this productPrint All

Using Basic Microdata

SDAC basic microdata files are available in MicrodataDownload. Basic microdata (CURF) files are designed for use in your own environment and have broader level data than other microdata products. For information about the data items available, see the Data Item List on the Downloads page.

Confidentiality
In accordance with the Census and Statistics Act 1905, all data are confidentialised before release. This is to avoid releasing information that could identify individuals, families, households, dwellings or businesses.

Records are confidentialised in the SDAC basic microdata by:
    • reducing detail of data items (e.g. age is collapsed to 5 year ranges)
    • removing data items (e.g. weekly income is not included)
    • modifying unusual records to protect against identification
    • reducing households with 7 or more persons to a maximum of 6 persons

The nature of the changes made, and the relatively small number of records involved ensure that the effect on data for analysis purposes is considered negligible. Changes to household structure was done in ways that minimised the impact on data about key populations and household, family and relationship compositions, however there may be some inconsistencies as a result of confidentiality changes. These changes also mean that estimates produced from the basic microdata may differ from those published in Disability, Ageing and Carers, Australia: Summary of Findings, 2018 (cat. no. 4430.0), subsequent publications and any TableBuilder or detailed microdata output. Comparison to published estimates for populations and key estimates can be found in Tables 1 and 2 below.

Table 1 compares previously published data with basic microdata to show the size of the change to the estimated population. The biggest percentage change due to the confidentialising process is in relation to Queensland estimates.

Table 1: Published (cat. no. 4430.0) population estimates (weighted) compared to the basic microdata estimates

Published
Basic Microdata
'000
'000
% change

New South Wales
7,944.1
7893.9
-0.63
Victoria
6,469.0
6434.9
-0.53
Queensland
4,920.9
4878.5
-0.86
South Australia
1713.4
1702.5
-0.63
Western Australia
2,508.5
2496.5
-0.48
Tasmania
523.5
522.1
-0.27
Northern Territory
178.8
178.5
-0.17
Australian Capital Territory
413.4
410.1
-0.80
Total
24,667.3
24,517.0
-0.61


Table 2 compares the published data and basic microdata to show the difference in prevalence of key populations. It shows that the impact of confidentialising the data is small.

Table 2
: Published (cat. no. 4430.0) disability and carer prevalence, and percentage of population aged 65 years or more, compared to the basic microdata

Disability rate
Carer rate
Persons aged 65 years or more

Published
Basic Microdata
Published
Basic Microdata
Published
Basic Microdata
New South Wales
16.9
17.0
10.8
10.8
16.2
16.3
Victoria
17.0
16.9
10.9
10.8
15.3
15.4
Queensland
19.1
19.0
10.8
10.8
15.6
15.7
South Australia
19.4
19.3
10.6
10.6
18.6
18.7
Western Australia
16.4
16.4
9.2
9.2
14.8
15.0
Tasmania
26.8
26.7
15.3
15.2
19.8
19.9
Northern Territory
11.6
11.7
5.7
6.3
9.2
9.0
Australian Capital Territory
19.4
19.3
12.1
12.2
13.0
13.1
Total
17.7
17.7
10.7
10.7
15.9
15.9

Counts and weights

Data are available from 65,487 people:
    • 53,824 from households
    • 11,663 from cared-accommodation

The Person level contains the item 'Living Arrangements' (SAS name = POPESTAB) which indicates whether the data were collected in the household or cared-accommodation component. The item has the category 'Persons living in establishments' for the cared-accommodation component and 'Persons living in households' for the household component. This item can be copied from the Person level to other levels of the file as required.

The number of records and weight applied to each of the different levels is shown below. For more information about the file structure, see the File Structure page. For more information about the weights, see the Weights and Identifiers section of the Data Item List.

Level
File name
Weight applied to level
Record Counts

1. Household
DAC18HH
Household weight
21,949
2. Family
DAC18FAM
Household weight
23,229
3. Income Unit
DAC18IU
Household weight
27,168
4. Person (the main level)
DAC18PER
Person weight
65,487
5. All conditions
DAC18CON
Person weight
130,953
6. Restrictions
DAC18RES
Person weight
113,369
7. Specific Activities
DAC18SPA
Person weight
164,493
8. Recipient
DAC18ALR
Person weight
4,669
9. Broad Activities
DAC18BRA
Person weight
85,649
10. Assistance providers
DAC18PAS
Person weight
24,744



Back to top of the page