Appendix: Admin source estimate alignment with SIH 2019-20
Comparisons of administrative incomes and equivalent SIH 2019-20 reported incomes are presented below.
Comparisons are for:
- the 26,189 people aged 15 years and above with PLIDA linkage (see section 1)
- each income type, by PLIDA data sources used
- current income, in weekly dollars
- government pensions and allowances income excluding Commonwealth Rent Assistance.
Results are based on unweighted data and do not account for sample error. Additionally, comparisons do not adjust for specific measurement differences between survey and admin data (e.g. misalignment in how specific incomes are categorised to an income type). As such, results provide only a general indication of the alignment of a source with SIH income. These are helpful to consider when determining their use towards final estimates.
Histograms below display the counts of people with an income value from administrative or SIH data, rounded to a multiple of some unit (e.g. 100 dollars). From each of these we can infer the relative proportions of individuals in the various income groups.
A. Employee income
Employee income was reported by 16,141 people in SIH (62%).
PLIDA produces employee income from four sources (STP, PS, ITR and DOMINO).
A.1 STP
The use of STP in estimating employee income produces:
- 5,322 instances of STP_EMP_CUR_1M (20% of all people)
- 5,477 instances of STP_EMP_CUR_3M (21%)
- 5,479 instances of STP_EMP_CUR_6M (21%).
Note that STP data is not available for SIH people interviewed in 2019.
Of the people having a variant of STP_EMP_CUR as listed above, 94% also had SIH information on employee income available. Summary statistics for these distinct types of employee income estimate are summarised in the table below.
| Variant | N | Admin mean | SIH mean | Admin median | SIH median | Correlation (p<0.0001) |
|---|---|---|---|---|---|---|
| STP_EMP_CUR_1M | 5,018 | 1,520 | 1,521 | 1,257 | 1,250 | 0.72 |
| STP_EMP_CUR_3M | 5,137 | 1,474 | 1,510 | 1,245 | 1,247 | 0.75 |
| STP_EMP_CUR_6M | 5,139 | 1,470 | 1,510 | 1,238 | 1,247 | 0.74 |
Those individuals having both STP_EMP_CUR_1M and SIH employee income, contribute to the distributions of these estimates, is displayed below. The distributions for STP_EMP_CUR_3M and STP_EMP_CUR_6M are similar.
A.2 PS
There are 8,924 instances where PS_EMP_CUR (34% of all people) is associated with any employer recorded in STP data between January 1 and June 30, 2020.
Of these people, 94% (8,355 people) have a comparable reported value of employee income in SIH. The mean PS_EMP_CUR for this group is $1,546, while SIH employee income is $1,569. The respective medians were $1,323 and $1,292. There was a strong positive correlation between these items (r=0.77, p<0.0001).
A.3 ITR
There were 12,972 instances where ITR_EMP_CUR (50% of people) is associated with any employer recorded in STP data between January 1 and June 30, 2020.
Of these people, 11,638 (90%) also have a reported value for SIH employee income. The mean ITR_EMP_CUR for these people is $1,464, while their SIH employee income is $1,516. The respective median employee income values are $1,253 and $1,247. There is a strong positive correlation between these items (r=0.76, p <0.0001).
A.4 DOMINO
There are 696 people with a positive DOM_EMP_CUR (3% of all people).
Of these people, 625 (90%) have SIH reported information on employee income also available. The mean DOM_CUR_EMP for this group is $488, while their SIH employee income is $560. The respective median employee incomes are $416 and $466. There is a moderate positive correlation between these items (r=0.61, p <0.0001).
B. Own unincorporated business income
1,497 people (6%) in SIH reported an instance of own unincorporated business income.
B.1 ITR
There were 3,025 instances of ITR_UBUS_CUR, where at least one of the contributing ITR income variables contain non-missing data (12% of people).
Of these instances, 30% (907 people) had both an admin and a reported SIH value for own unincorporated business income. The mean ITR_UBUS_CUR value is $926, while the SIH value is $1,034. The respective medians are $513 and $610. There was a strong positive correlation between these items (r=0.70, p<0.0001).
C. Government pensions and allowances
8,659 people (33%) reported an Australian government pension and allowance income in SIH.
C.1 DOMINO
There were 10,864 people with DOM_GOV_CUR (41% of all people).
Of these, 7,194 (66%) also have SIH reported information on government pensions and allowances available. The mean DOM_GOV_CUR for this group is $371 and the mean SIH amount was $370. The respective medians are $366 and $389. The correlation of DOM_GOV_CUR with SIH employee income is strong and positive (r=0.81, p <0.0001).
C.2 ITR
There were 144 people identified with ITR_GOV_CUR payments (1% of people). Of these, there were 103 people with ITR_GOV_CUR (72%) who also had a government pension and allowance amount reported in SIH. The mean ITR_GOV_CUR is $342, while the mean SIH value was $381. The respective medians are $224 and $298. These items are weakly positively correlated (r=0.13, p=0.15).
D. Investment income
16,542 people in SIH (63%) reported investment income.
D.1 ITR
There were 13,351 people with a non-zero ITR_INV_CUR amount (51% of people).
Of these, there were 8,784 people with a non-zero ITR_INV_CUR (66%) who also reported investment income in SIH. The mean ITR_INV_CUR value is $255, while the mean SIH value is $218. The respective medians are $13 and $9. There is a moderate positive correlation between these items (r=0.65, p<0.0001).
E. Superannuation pensions and annuities
2,882 (11% of people) in SIH reported superannuation pensions and annuities income.
E.1 ITR
There are 656 people with non-zero ITR_SUP_CUR (3% of people).
Of these, there were 546 people (83%) with an ITR_SUP_CUR value who also had a SIH superannuation pension and annuity value. For these people, the mean ITR_SUP_CUR is $756, while the mean SIH value is $890. The respective medians are $628 and $798. There is a strong positive correlation between these items (r=0.74, p<0.0001).
E.2 SAE
There are 2,532 people with SAE_SUP_CUR (10% of people).
Of these, 1,761 (70%) reported a SIH value. For these people, the mean SAE_SUP_CUR value is $476 and the SIH mean is $609. The respective medians were $294 and $479. There is a moderate positive correlation between these items (r=0.53, p<0.0001).
F. Other regular transfers
2,445 (9% of people) reported instances of other regular transfer income in SIH.
F.1 ITR
There are 1,283 people with non-zero ITR_OTH_CUR (5% of people).
Of these, 73 people (6%) also had a reported value of other regular transfers in SIH. For these people, the mean ITR_OTH_CUR is $213 and the SIH mean is $575. The respective medians are $9 and $327. There is a moderate positive correlation between these items (r=0.43, p=0.0002).