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7 Students at boarding schools, patients in hospitals, residents of homes (e.g. retirement homes, homes for people with disabilities), and inmates of prisons are excluded from all supplementary surveys.
8 This supplementary survey was conducted in both urban and rural areas in all states and territories, but excluded people living in Indigenous communities in very remote parts of Australia.
9 In addition to those already excluded from the LFS, employees who worked solely for payment in kind in their main job are excluded from this survey.
10 The estimates in this publication relate to people covered by the survey in August 2009. In the LFS, coverage rules are applied which aim to ensure that each person is associated with only one dwelling and hence has only one chance of selection in the survey. See Labour Force, Australia (cat. no. 6202.0) for more details.
11 Supplementary surveys are not always conducted on the full LFS sample. Since August 1994 the sample for supplementary surveys has been restricted to no more than seven-eighths of the LFS sample.
12 The LFS sample size in August 2009, was approximately one-third smaller than the sample size in August 2007. This is due to an 11% sample reduction that was implemented from November 2007 to June 2008 based on the 2006 sample design, and an additional 24% sample reduction implemented in July 2008. Detailed information about the sample reduction is provided in Information Paper: Labour Force Survey Sample Design, Nov 2007 (Second edition) (cat. no. 6269.0).
13 The reduced sample will still be representative, with selections made across all parts of Australia.
14 The initial sample for the August 2009 LFS consisted of 27,445 private dwelling households and special dwelling units. Of the 22,129 private dwelling households and special dwelling units that remained in the survey after sample loss (e.g. households selected in the survey which had no residents in scope for the LFS, vacant or derelict dwellings and dwellings under construction), approximately 20872, or 94.3% were fully responding to the Employee Earnings, Benefits and Trade Union Membership Survey. The number of completed interviews obtained from these private dwellings and special dwelling units (after taking into account scope, coverage and sub-sampling exclusions) was 18,997.
RELIABILITY OF THE ESTIMATES
15 Estimates in this publication are subject to sampling and non-sampling errors:
16 The estimates are based on information collected in the survey month and, due to seasonal factors, may not be representative of other months of the year.
17 From 2006, occupation data are classified according to the ANZSCO - Australian and New Zealand Standard Classification of Occupations, First Edition, 2006 (cat. no. 1220.0). This new classification replaces ASCO - Australian Standard Classification of Occupations, Second Edition, 1997 (cat. no. 1220.0). Data classified according to ASCO can be obtained on request.
18 Also from 2006, industry data are classified according to the Australian and New Zealand Standard Industrial Classification (ANZSIC), 2006 (cat. no. 1292.0). This new classification replaces the Australian and New Zealand Standard Industrial Classification (ANZSIC), 1993 (cat. no. 1292.0). Data classified according to ANZSIC 1993 can be obtained on request.
19 Country of birth data are classified according to the Standard Australian Classification of Countries (SACC), Second Edition (cat. no. 1269.0).
20 Educational attainment data are classified according to Australian Standard Classification of Education (ASCED) (cat. no. 1272.0).
NOTES ON ESTIMATES
21 Information relating to main job earnings and second job earnings not provided by the respondent have been imputed. In August 2009 there were 2,035 cases where information relating to main job earnings was not provided by the respondent, and 96 cases where information relating to second job earnings was not provided by the respondent. Where this was the only information missing from the record, a value has been imputed based on answers provided from another respondent with similar characteristics (referred to as the donor). Donor records were selected for main job imputation by matching information on sex, age, state or territory of usual residence and labour force characteristics (full-time or part-time in main job, industry, occupation, hours worked in main job) of the person with missing information.
22 Donor records were selected for second job imputation by matching information on sex, age, state or territory of usual residence, area of usual residence and owner manager status. Depending on which values were to be imputed, donors were chosen from the pool of individual records with complete information for the block of questions where the missing information occurred.
23 Care should be taken when using estimates of mean weekly earnings or median weekly earnings. Employees who did not draw a wage or salary are excluded from estimates of mean weekly earnings or median weekly earnings. This group consists of people working in their own incorporated enterprise.
24 Employees (excluding OMIEs) are classified as 'With paid leave entitlements' if they said 'yes' to either of the following questions:
COMPARABILITY OF TIME SERIES
25 Revisions are made to population benchmarks for the LFS after each five-yearly Census of Population and Housing. The last such revision was made in February 2009 to take account of the results of the 2006 Census of Population and Housing. Estimates from supplementary surveys conducted from and including February 2009 are based on these 2006 population benchmarks.
26 Care should be taken when comparing movements in mean weekly earnings and employment benefits estimates that include the July 1991 and August 1997 surveys. The usual period between surveys is 12 months; however, in 1991 the elapsed time was 11 months (August 1990 to July 1991), and in 1992 it was 13 months (July 1991 to August 1992). In 1997, the elapsed time was 2 years (August 1995 to August 1997).
27 A change was made in 2002 to the method used to determine whether an employee works full-time or part-time in their main job. Prior to 2002, 'full-time or part-time employees in main job' was derived from a self-perception question in which all employees were asked 'Is your job full-time or part-time?'. Following the redesign in 2001 of the LFS questionnaire, actual hours worked in main job in the reference week is now collected. From August 2002, data on hours worked in main job are used to derive full-time or part-time status of employees in main job.
28 This approach is consistent with the method used in the LFS to derive full-time or part-time status in all jobs. For further details see Glossary entries 'Full-time employees in main job' and 'Full-time workers'.
29 In 2007 there was a change to the data item 'Whether considered job to be casual'. From 2007, all employees (excluding OMIES) were asked if they were employed as a casual. In 2006 and previous years, owner managers of incorporated enterprises and employees who received both paid sick and paid holiday leave were not asked if they were employed as a casual. As a result of this change there was a break in series. Users therefore need to exercise care when comparing the number of people who considered their job to be casual in this publication with publications prior to August 2007.
30 In 2009, questions relating to employee benefits were redeveloped to better capture information on current employment benefits that employees received in the last 12 months. As a result, new data items presented in the 2009 publication include, 'Employment benefits received from current employer in the last 12 months', 'Salary sacrifice arrangements in last pay period', 'Whether salary sacrificed to superannuation in last pay period' and 'Whether salary sacrificed to superannuation in last 12 months'.
31 Additional data items on employees' educational qualifications are presented in the 2009 publication. These are 'Level of highest educational attainment', 'Level of highest non-school qualification' and 'Highest year of school completed'. Further data items collected in 2009 include, 'Whether paid a set amount or by the hour', 'Whether earnings varied from one pay period to the next', 'Whether usually works paid or unpaid extra hours or overtime', 'Whether guaranteed a minimum number of hours of work', 'Whether paid full adult rate of pay', 'Number of weeks of paid holiday leave entitled to', 'Whether able to accrue paid holiday leave', 'Number of weeks of paid maternity/paternity leave' and 'Whether taken paid study leave in the last 12 months'.
32 In 2009, information on 'Number of dependent children under 15 years of age' and 'Superannuation coverage' was not collected. Information were not collected on 'Number of children in family aged under 15 years' and 'Whether employer makes contributions into a superannuation scheme on behalf of employee'. As a result of this change there is a break in series. Users therefore need to exercise care when comparing data with previous years.
33 In 2009, a new population 'Employees who were trade union members' is included in the publication. This population differs from the existing population 'Employees who were members of a trade union in their main job' in that all employees are asked the question 'Do you belong to a trade union'? Respondents who answered 'Yes' to this question comprise the population, 'Employees who were trade union members'. This group of employees are then asked 'Is this in connection with your main job'? Those who responded 'Yes' to this question comprise the population 'Employees who were members of a trade union in their main job'. In addition, new data items on trade union membership are presented in the 2009 publication. These are, 'Trade union membership', 'Length of current trade union membership', 'Duration since previously a trade union member' and 'Previous trade union membership'.
34 The estimates of earnings, in this publication, have been produced in accordance with the revised conceptual framework for measures of employee remuneration, as outlined in Information paper: Changes to ABS Measure of Employee Remuneration, Australia 2006 (cat. no. 6313.0).
35 From 2007, as a result of the change in concept of earnings being measured, employees were asked to include salary sacrifice when estimating their earnings. In previous years, there has not been any explicit reference to the treatment of salary sacrifice. However, it is probable that some employees were already including amounts of salary sacrifice in their estimates of earnings, depending upon how their pay was reported. This change has resulted in a break in series. Users therefore need to exercise care when comparing the earnings of employees in this publication with previous releases.
36 The current imputation method has been used since the 2005 survey. A similar method of imputation was used for the 2004 survey. The differences between the 2004 and current imputation methods are that donors are matched where possible on a finer level of detail, and second job earnings are now imputed whereas in 2004 they were not.
37 From 2009, additional information, relating to the number of hours that a respondent's last pay period covered in their main job, was used in the imputation process.
38 These changes in methodology are expected to have improved the imputed earnings data at the unit record level, but should not have had much impact on aggregate estimates.
39 Prior to 2004 imputation was not used, hence employees whose weekly earnings could not be determined were excluded from estimates of mean or median weekly earnings. Care should therefore be taken when comparing earnings data from 2004 onwards with earnings data prior to 2004. To compare the change in method from 2003 to 2004 please see paragraph 28 of the Explanatory Notes in Employee Earnings, Benefits and Trade Union Membership, August 2004 (cat. no. 6310.0).
40 Prior to 2004, weekly earnings could not be determined for a number of persons. This group included persons refusing to answer questions about their weekly earnings. Such cases are now imputed.
COMPARABILITY WITH MONTHLY LFS STATISTICS
41 Due to differences in the scope and sample size of this supplementary survey and that of the LFS, the estimation procedure may lead to some small variations between labour force estimates from this survey and those from the LFS.
COMPARABILITY WITH EMPLOYER-BASED AVERAGE WEEKLY EARNINGS SURVEY
42 Caution should be exercised when comparing estimates of mean weekly earnings in this publication with estimates of average weekly earnings included in the quarterly publication Average Weekly Earnings, Australia (cat. no. 6302.0), which are compiled from a survey of employers. There are important differences in the concepts, scope and methodology of the two surveys.
43 Estimates of average weekly earnings from the quarterly publication Average Weekly Earnings, Australia (cat. no. 6302.0), exclude amounts salary sacrificed. From 2007, amounts salary sacrificed are included in the estimates of mean and median weekly earnings for the Employee Earnings, Benefits and Trade Union Membership survey.
44 The quarterly Survey of Average Weekly Earnings excludes employees in the industries of Agriculture, forestry and fishing and Private households employing staff, both of which are included in this household survey. The quarterly Survey of Average Weekly Earnings collects information from employers who complete a mailed questionnaire with details of their employees' total gross earnings and the total number of employees. For this household survey, respondents are either interviewed personally, or another adult member of their household responds on their behalf.
45 The methodology used in this household survey may result in non-sampling error not evident in surveys of employers (and vice versa). This may account for some of the differences between the results of the two surveys.
PREVIOUS SURVEYS OF WEEKLY EARNINGS
46 Similar surveys have been conducted annually since August 1975, except 1991 when the survey was conducted in July, and in 1996 when the survey was not conducted.
47 Prior to 1998, this publication was titled Weekly Earnings of Employees (Distribution), Australia (cat. no. 6310.0). The change in title reflects the inclusion of employment benefits and trade union membership data previously released in other publications.
PREVIOUS SURVEYS OF EMPLOYMENT BENEFITS
48 Results of previous surveys on employment benefits have been published in:
PREVIOUS SURVEYS OF TRADE UNION MEMBERS
49 Information on trade union membership was first collected in 1976, then biennially in its current format, from 1986 to 1992. From this time it was conducted annually (with limited data available every second year). Results of previous surveys were published in:
50 Limited data on trade union membership have also been published in:
51 The ABS plans to conduct this survey again in August 2010.
52 ABS surveys draw extensively on information provided by individuals, businesses, governments and other organisations. Their continued cooperation is very much appreciated: without it, the wide range of statistics published by the ABS would not be available. Information received by the ABS is treated in strict confidence as required by the Census and Statistics Act 1905.
PRODUCTS AND SERVICES
53 Additional tables are available in spreadsheet format with time series data. These tables will be made available with the publication from the ABS web site.
54 Other publications which may be of interest include:
55 Current publications and other products released by the ABS are available from the Statistics Page on the ABS website. The ABS also issues a daily Release Advice on the web site which details products to be released in the week ahead.
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