2080.5 - Information Paper: Australian Census Longitudinal Dataset, Methodology and Quality Assessment, 2006-2011  
ARCHIVED ISSUE Released at 11:30 AM (CANBERRA TIME) 18/12/2013   
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Contents >> 3. Linkage results

3. LINKAGE RESULTS

At the completion of the linkage process, 800,759 (82%) out of the 979,661 records from the 2006 Census sample (Wave 1) were linked to a 2011 Census (Wave 2) record to create the linked ACLD. This linkage rate was consistent with results from other Bronze linkage projects using the 2006 and 2011 Census.

All results presented in this publication (unless identified in the relevant table) are based on characteristics from the Wave 1 sample and have been confidentialised to prevent the identification of individuals.

Table 2 displays the linkage rate for a range of sub-populations.

TABLE 2 - LINKAGE RATES, By selected characteristics
2006 Census sample

ACLD
Linkage rate
(no.)
(no.)
(% )
Sex
Male
480 285
390 487
81.3
Female
499 372
410 274
82.2
Age group (years)
0-14
194 017
170 834
88.1
15-19
66 247
51 220
77.3
20-24
66 512
49 327
74.2
25-29
62 249
48 642
78.1
30-39
140 271
117 655
83.9
40-49
142 911
123 946
86.7
50-59
126 285
108 962
86.3
60-69
86 385
71 906
83.2
70-74
31 004
23 678
76.4
75 and over
63 784
34 586
54.2
Indigenous status
Non-Indigenous
942 253
775 419
82.3
Aboriginal
19 697
13 340
67.7
Torres Strait Islander
1 449
923
63.7
Both Aboriginal and Torres Strait Islander
839
543
64.7
Not stated
15 416
10 530
68.3
State/Territory of usual residence
New South Wales
323 136
263 369
81.5
Victoria
244 095
203 668
83.4
Queensland
192 606
154 013
80.0
South Australia
75 481
62 239
82.5
Western Australia
95 795
77 921
81.3
Tasmania
23 787
19 583
82.3
Northern Territory
8 469
6 226
73.5
Australian Capital Territory
16 186
13 680
84.5
Remote areas
Major Cities
669 274
552 339
82.5
Inner Regional
195 401
159 611
81.7
Outer Regional
92 396
73 122
79.1
Remote
13 989
10 533
75.3
Very Remote
6 546
4 602
70.3
No Usual Address
2 029
539
26.6
Total(a)(b)(c)
979 661
800 759
81.7

(a) Data presented in the table have been confidentialised. As a result, the sum of individual categories may not align with totals.
(b) Includes Other Territories.
(c) Includes Migratory areas.



The linkage rates that were achieved for the ACLD were relatively consistent across most sub-populations and were in line with expected results. Compared with the national average of 82%, the sub-populations which achieved the highest linkage rates were persons:
  • aged 0 to 14 years (88%), followed by 40 to 49 years (87%) and 50 to 59 years (86%)
  • of non-Indigenous origin (82%)
  • who usually lived in the ACT (85%) and Victoria (83%)
  • who usually lived in Major cities (83%).


The subpopulations which achieved the lowest linkage rates were persons:
  • aged 20-24 years (74%) and 75 years and over (54%)
  • of Aboriginal (68%), Torres Strait Islander (64%) or both Aboriginal and Torres Strait Islander origin (65%)
  • who usually lived in the Northern Territory (74%)
  • who usually lived in remote (75%) and very remote areas (70%) or who had no usual address in 2006 (27%).


Traditionally, the Census Post Enumeration Survey (PES) has shown that the Census has higher rates of undercount for people of Aboriginal and/or Torres Strait Islander origin, those aged between 20 and 29 and for those in the Northern Territory. As expected, the lower ACLD linkage rates broadly aligned with the same groups that experience higher levels of undercount in the Census. One additional group that had lower linkage rates were persons aged 75 and over at the time of the 2006 Census who, due to age, had an increased risk of death over the ensuing five years. Further information on Census undercount can be found in Census of Population and Housing - Details of Undercount, 2011 (cat. no. 2940.0)

Further data cubes, demonstrating the linkage rates for various sub-populations are available as an attachment to this Information paper.




This section contains the following subsection :
      3.1 Linkage accuracy
      3.2 Characteristics of linked and unlinked 2006 Census sample
      3.3 Reasons for unlinked records
      3.4 Weighting

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