|Page tools: Print Page Print All RSS Search this Product|
JOB VACANCIES SURVEY
Data published for the job vacancies series by sector are available on an original, seasonally adjusted, and trend basis. Industry and state data are only published on an original basis. As a result of JVS being suspended in 2008 and 2009, there is a gap in all series: original, seasonally adjusted and trend, for five quarters between August 2008 and August 2009 inclusive.
Estimates are compiled according to the concepts and definitions outlined in Chapter 4: Employment and Chapter 10: Job vacancies.
The scope of the survey is restricted to employing businesses. In addition, the standard scope exclusions for ABS labour-related business surveys (outlined in Chapter 23: Methods Used in ABS Business Surveys) apply to this survey.
Details of the total number of job vacancies available for immediate filling on the survey reference date are obtained on a quarterly basis from selected businesses. Data are collected via online electronic collection, and/or telephone interviews.
The survey reference date for job vacancies is the third Friday in the middle month of the quarter.
Follow-up procedures are in place to obtain information from respondents who don't lodge a completed form by the due date. A minimum response of 95% is generally achieved for the survey as a whole, and for each state and/or industry.
A probability sample of statistical units (employing businesses) is drawn from the ABS Business Register using the process outlined in Chapter 23. Variables used to stratify the survey frame are:
Statistical units with benchmark employment greater than a set cut off (this cut off will vary for different states/territories) are completely enumerated. Strata with a very small number of statistical units may also be completely enumerated, but such strata may become sampled strata if the number of units increases sufficiently.
In addition to constraints outlined in Chapter 23, sample selection is constrained by ensuring that there is minimum overlap with other labour-related business surveys.
SAMPLE SIZE AND ALLOCATION
Approximately 5,200 statistical units are selected in the sample to yield a live sample of approximately 4,850 units.
The sample is allocated optimally across the strata using a technique designed to minimise the variance of job vacancies estimates at both the national and state/territory level.
The sample is updated each quarter to reflect changes in the ABS Business Register. Approximately 8% of the sample for the non-completely enumerated strata is replaced each quarter. The JVS population is updated quarterly to take account of:
Sample rotation is implemented for the majority of strata, but is not implemented where the population of a stratum is so small that units rotating out of the sample would be rotated back in after only a short interval.
Number raised estimation is used in all strata.
For non-responding units in the sampled strata, the Live Respondent Mean method of imputation is used.
For non-responding units in the completely enumerated (CE) strata, an imputed growth rate is applied to the previous quarter's reported value for that unit. Growth rates are estimated for each industry division, based on data provided by CE units in the current and previous quarter. Where data for non-responding CE units have not been reported in the previous quarter, ratio imputation is used. The ratio of job vacancies to benchmark employment is calculated at industry division level for responding units from the current quarter. This ratio is then applied to the benchmark employment for the non-responding unit to arrive at the imputed value for job vacancies.
Prior to November 2017, survey outliers were handled by using the 'surprise outlier' technique. From November 2017, the winsorisation methodology was introduced as the primary method to treat outliers in JVS. Winsorisation moderates the impact of an outlier business without the harsh impact of the surprise outliering approach. For more information, refer to Chapter 16.
Survey estimates include an adjustment called Business Provisions, to allow for births and resurrections of businesses that have occurred up to the end of the survey reference period but which are not reflected on the survey frame.
For further information on estimation methods used in ABS business surveys, refer to Chapter 23.
RELIABILITY OF THE ESTIMATES
Estimates from the survey are subject to both sampling and non-sampling error. The standard errors of survey estimates are published in Job Vacancies, Australia (cat. no. 6354.0). For further information on sampling and non-sampling error, refer to Chapter 16.
The Bootstrap technique is used to calculate estimates of variance for this survey. The Bootstrap is a variance estimation method which relies on the use of replicate samples, essentially sampling from within the main sample. Each of these replicate samples is then used to calculate a replicate estimate and the variation in these replicate estimates is used to calculate the variance of a particular estimate.
DATA COMPARABILITY OVER TIME
The JVS was suspended following the May 2008 survey and was reinstated for the November 2009 survey. As a result of JVS being suspended, there is a gap in all series: original, seasonally adjusted and trend, for five quarters between August 2008 and August 2009 inclusive. The ABS cannot produce reliable estimates by collecting this missing data retrospectively, and has not been able to fill the gap using other data sources. For further information, see the Information Paper: Reinstatement of Job Vacancies Survey (cat. no. 6354.0.55.001).
In order to provide a high degree of consistency and comparability over time, changes to survey methods, concepts, data item definitions, and frequency of collection are made as infrequently as possible. Significant changes have included:
BACK TO TOP
These documents will be presented in a new window.