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. |