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QUALITY DECLARATION - SUMMARY
The scope of the survey was all employing and significant non-employing private sector businesses and organisations with a non-cancelled ABN and active ITW or GST role, classified to the following ANZSIC06 classes:
Note that government organisations were excluded from the scope of the survey.
The period covered by this collection, was in general, the twelve months ended 30 June 2010. Although financial estimates relate to the full twelve months, employment estimates relate to the last pay period ending in June 2010. As a result, estimates of wages and salaries per person may be affected by any fluctuations in employment during the reference period.
The collection was designed to deliver national estimates, and where possible state estimates for all in-scope industries.
This is an irregular collection where estimates are generally available within 12 months of the reference period to which they relate. For the 2009–10 reference period, questionnaires were dispatched by the ABS in August 2010 and estimates scheduled for release in June 2011.
The ABS aims to produce high quality data from its industry collections while minimising the reporting burden on businesses. To achieve this, extensive effort is put into survey and questionnaire design, collection procedures and processing. The 2009–10 survey used generalised regression estimation. Generalised regression estimation is a form of ratio estimation which makes use of auxiliary data items which are strongly correlated with key data items directly collected by the ABS from businesses. The auxiliary variables used in this survey were turnover and wages from data sourced from the Australian Taxation Office (ATO). Use of this methodology allowed high quality statistics to be produced from a small sample of 4,333 businesses.
Two types of error can occur in estimates that are based on a sample survey; sampling error and non-sampling error.
Sampling error occurs when a sample, rather than the entire population, is surveyed. It reflects the difference between estimates based on a sample and those that would have been obtained had a census been conducted. One measure of this difference is the standard error. There are about two chances in three that a sample estimate will differ by less than one standard error from the figure that would have been obtained if all businesses had been included in the survey, and about nineteen chances in twenty that the difference will be less than two standard errors.
Another measure of sampling error is the relative standard error, which is obtained by expressing the standard error as a percentage of the estimate to which it refers. The relative standard error is a useful measure in that it provides an immediate indication of the sampling error in percentage terms, and this avoids the need to refer also to the size of the estimate. Relative standard errors of key estimates are available in the Technical note on Data Quality of Health Care Services, 2009-10 (cat. no. 8570.0).
Non-sampling error arises from inaccuracies in collecting, recording and processing the data. Every effort was made to minimise reporting error, by the careful design of questionnaires, intensive training of survey analysts, and efficient data processing procedures.
Non-sampling error also occurs when information cannot be obtained from all businesses selected in the survey. For the 2009–10 health services survey, there was a 92.6% response rate from all businesses that were surveyed and found to be operating during the reference period. Data were imputed for the remaining 7.4% of operating businesses. Imputed responses contributed 6.4% to the estimate of total income for all selected industries.
The Medical Services survey was previously conducted by the ABS for the 1994–95 and 2001–02 reference periods. Data released in Private Medical Practitioners 2002, Australia (cat. no. 8689.0) and Private Medical Practices 2001-02, Australia (cat. no. 8685.0).
The Allied Health survey was previously conducted in respect of 1997-98, and data released in Chiropractic and Osteopathic Services 1997–98, Australia (cat. no. 8550.0), Dental Services 1997–98, Australia (cat. no. 8551.0), Physiotherapy Services 1997–98, Australia (cat. no. 8552.0), Optometry and Optical Dispensing Services 1997–98, Australia (cat. no. 8553.0), and Audiology and Audiometry Services 1997–98, Australia (cat. no. 8554.0).
While the ABS seeks to maximise consistency and comparability over time by minimising changes to the survey, sound survey practice requires ongoing development to maintain the integrity of the data, their relevance to the changing needs of users and the efficiency of the survey. There have been substantial changes in scope and methodology between the surveys, so users are advised not to make historical comparisons with previous iterations of this survey, as this survey was not designed to support accurate estimates of change over time.
These changes include:
The estimates from the Health Care Services Survey are available only as original time series and are not seasonally or trend adjusted.
Although financial estimates in this release relate to the full twelve months, employment estimates relate to the last pay period ending in June of the given year.
Further information about terminology and other technical aspects associated with these statistics can be found in the publication Health Care Services (cat. no. 8570.0), which contains detailed Explanatory Notes, a Technical Note on Data Quality, a Technical Note on Estimation methodology and a Glossary.
Data from the 2009–10 Health Care Services Survey are available in a variety of formats. The formats available free of charge on the website are:
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