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2940.0 - Census of Population and Housing - Details of Undercount, 2011  
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 21/06/2012   
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UNDERCOUNT ADJUSTMENT FACTORS


UNDERCOUNT ADJUSTMENT FACTORS

While estimates of net undercount are important for an effective understanding of the completeness of Census counts, undercount adjustment factors are the means for adjusting Census counts.

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 Census category. Table 12 provides corresponding PES population estimates, Census counts and net undercount adjustment factors for the categories previously discussed.

The undercount adjustment factor 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 who are temporarily overseas. For information on the calculation of ERP, see the ABS publication Australian Demographic Statistics, December quarter 2011 (cat. no. 3101.0), released on 20 June 2012.

12 NET UNDERCOUNT, Population estimates, Census counts and Undercount adjustment factors - 2011

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

Australia
21 879 261
38 315
21 504 721
374 540
38 315
1.017
0.002
State/territory of usual residence
New South Wales
7 054 301
26 865
6 917 654
136 647
26 865
1.020
0.004
Victoria
5 410 949
17 864
5 354 043
56 906
17 864
1.011
0.003
Queensland
4 409 948
17 431
4 332 733
77 215
17 431
1.018
0.004
South Australia
1 613 850
6 045
1 596 567
17 283
6 045
1.011
0.004
Western Australia
2 297 111
12 004
2 239 193
57 918
12 004
1.026
0.005
Tasmania
505 616
3 076
495 355
10 261
3 076
1.021
0.006
Northern Territory
227 675
3 074
211 959
15 716
3 074
1.074
0.015
Australian Capital Territory
359 812
3 055
357 217
2 595
3 055
1.007
0.009
Sex
Male
10 872 858
24 534
10 632 062
240 796
24 534
1.023
0.002
Female
11 006 403
20 772
10 872 659
133 744
20 772
1.012
0.002
Age group (years)
0-4
1 438 176
8 017
1 420 913
17 263
8 017
1.012
0.006
5-9
1 371 672
7 781
1 351 746
19 926
7 781
1.015
0.006
10-14
1 376 784
7 664
1 370 870
5 914
7 664
1.004
0.006
15-19
1 441 530
9 044
1 405 635
35 895
9 044
1.026
0.006
20-24
1 568 558
12 812
1 460 410
108 148
12 812
1.074
0.009
25-29
1 605 452
13 444
1 512 816
92 636
13 444
1.061
0.009
30-34
1 498 425
10 407
1 453 479
44 946
10 407
1.031
0.007
35-39
1 537 123
9 424
1 519 916
17 207
9 424
1.011
0.006
40-44
1 563 684
8 856
1 542 661
21 023
8 856
1.014
0.006
45-49
1 509 411
8 063
1 503 920
5 491
8 063
1.004
0.005
50-54
1 460 951
8 411
1 447 204
13 747
8 411
1.009
0.006
55+
5 507 492
11 500
5 515 151
-7 659
11 500
0.999
0.002
Registered marital status
Never married(c)
10 490 920
29 990
10 105 325
385 595
29 990
1.038
0.003
Widowed, divorced or separated
2 915 337
14 630
2 939 608
-24 271
14 630
0.992
0.005
Married
8 473 004
18 737
8 459 788
13 216
18 737
1.002
0.002
Indigenous status
Indigenous
662 335
14 274
548 147
114 188
14 274
1.208
0.026
Non-Indigenous
21 216 926
37 272
19 898 127
1 318 799
37 272
1.066
0.002
Not stated(d)
-
-
1 058 447
-
-
-
-
Country of birth
Australia
16 078 800
30 156
15 016 402
1 062 398
30 156
1.071
0.002
England
955 734
7 049
911 539
44 195
7 049
1.048
0.008
New Zealand
529 937
6 344
483 401
46 536
6 344
1.096
0.013
China
374 935
8 934
318 970
55 965
8 934
1.175
0.028
India
327 051
6 075
295 357
31 694
6 075
1.107
0.021
Italy
194 287
2 513
185 403
8 884
2 513
1.048
0.014
Vietnam
201 125
4 313
185 030
16 095
4 313
1.087
0.023
Philippines
188 325
3 603
171 219
17 106
3 603
1.100
0.021
South Africa
157 387
3 383
145 675
11 712
3 383
1.080
0.023
Scotland
135 002
2 208
133 420
1 582
2 208
1.012
0.017
Other overseas
2 736 677
15 894
2 462 873
273 804
15 894
1.111
0.006
Not stated(d)
-
-
1 195 432
-
-
-
-

- nil or rounded to zero (including null cells)
(a) PES estimate of the number of people who should have been counted in the Census.
(b) Includes imputed persons in non-responding dwellings.
(c) Includes those who are living with a de facto partner and have never been in a registered marriage.
(d) People whose Census form was either not received or partially completed.



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