TECHNICAL NOTE - ESTIMATION METHODOLOGY
1 The availability of Business Activity Statement (BAS) data collected by the Australian Taxation Office (ATO) has provided the Australian Bureau of Statistics (ABS) with opportunities to improve the efficiency of collection designs and estimation for its business surveys, while at the same time reducing the reporting burden placed on businesses. Under taxation law, data may be passed by the Commissioner for Taxation to the ABS for specified statistical purposes. Accordingly, turnover and wages information sourced from ATO BAS data was used to improve the accuracy of the 2014-15 industry estimates which were produced using data items collected directly by the ABS from businesses.
2 The 2014-15 survey uses number raised estimation. Number raised weights are given by N/n (where N is the total number of units in the population for the stratum, and n is the number of responding units in the sample for that stratum). The weight assigned to each survey unit indicates the number of units in the target population that the survey unit is meant to represent. For example, a survey unit with a weight of 100 represents 100 units in the population. Using number-raised weights, each survey unit in a stratum is given the same weight. Number-raised weights can only be used to weight simple random samples.
3 The following diagram illustrates the ways in which Australian businesses contribute to the estimates in this publication.
For the purpose of compiling the estimates in this publication, data for businesses as recorded on the ABS Business Register (ABSBR) contribute via one of two categories (or 'streams') in accordance with significance and collection-related characteristics.
Completely enumerated (CE) stream
The CE stream consists of directly collected survey data for those units recorded on the ABSBR as having employment between 100 and 1000 depending on industry, plus additional economically significant units.
Completely enumerated (CE) employment thresholds
Number raised estimation stream
|100|| A. Agriculture, Forestry and Fishing|
| D. Electricity, Gas, Water and Waste Services|
|300|| E. Construction|
|400|| O. Public Administration and Safety|
|500|| C. Manufacturing|
| P. Education and Training|
|600|| I. Transport, Postal and Warehousing|
| L. Rental, Hiring and Real Estate Services|
|700|| B. Mining|
| N. Administrative and Support Services|
| S. Other Services|
|900|| J. Information Media and Telecommunications|
| K. Financial and Insurance Services|
|1000|| F. Wholesale Trade|
| G. Retail Trade|
| H. Accommodation and Food Services|
| M. Professional, Scientific and Technical Services|
| Q. Health Care and Social Assistance|
| R. Arts and Recreation Services|
The number raised estimation stream comprises directly collected data for those sampled units which are not in the CE stream and have turnover, in aggregate, above the bottom 2.5 percentile of BAS sales for that subdivision, or are identified as employing businesses (based on ATO information).
Estimates for each of the selected industries were produced by aggregating the contributing data streams.