2940.0 - Census of Population and Housing: Details of Overcount and Undercount, Australia, 2016 Quality Declaration 
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 27/06/2017   
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UNDERCOUNT ADJUSTMENT FACTORS

While estimates of net undercount are important for an effective understanding of the completeness of Census counts, undercount adjustment factors provide an indication of how much the Census count for a given category would need to be adjusted in order to reflect the PES population estimate for that category.

The undercount adjustment factor is the ratio of the PES population estimate to the actual Census count. This factor can be applied to the Census count for any category to indicate how many people should have been counted in that category. For example, the Census count of 23,397,296 persons in Australia multiplied by the adjustment factor of 1.010 (or unrounded: 1.00967662) indicates that 23,623,703 persons should have been counted in the Census.

Population Estimates, Census Counts and Undercount Adjustment Factors, 2016

PES population
estimate
Census count
(a)(b)
Net undercount
Undercount adjustment factor
no.
SE
no.
no.
SE
no.
SE

New South Wales
7 539 414
30 837
7 480 220
59 194
30 837
1.008
0.004
Victoria
6 012 621
25 059
5 926 593
85 028
25 059
1.015
0.004
Queensland
4 763 760
22 882
4 703 210
60 550
22 882
1.013
0.005
South Australia
1 679 607
8 595
1 676 633
2 974
8 595
1.002
0.005
Western Australia
2 483 901
14 081
2 474 424
9 477
14 081
1.004
0.006
Tasmania
510 261
3 444
509 965
296
3 444
1.001
0.007
Northern Territory
240 874
3 720
228 854
12 020
3 720
1.053
0.016
Australian Capital Territory
393 265
5 347
397 397
-4 132
5 347
0.990
0.013
Australia
23 623 703
48 328
23 397 296
226 407
48 328
1.010
0.002

(a) Includes imputed persons in non-responding dwellings.
(b) Refers to Census counts which correspond to the scope of the PES and may differ slightly from aggregate counts in other Census products.


The undercount adjustment factor is not, and therefore should not be, used alone to derive an alternative measure of the Estimated Resident Population (ERP). Official population estimates include additional data and adjustments for usual residents of Australia, such as for those who were temporarily overseas on Census night. For information on the calculation of ERP, see the ABS publication Australian Demographic Statistics, December 2016 (cat. no. 3101.0), released on 27 June 2017.