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MULTIPURPOSE HOUSEHOLD SURVEY
In addition to the labour-related topics mentioned above, the MPHS program also includes other social topics not related to labour statistics, such as:
For all MPHS topics, general demographic information such as age, sex, labour force characteristics, education and income are also available.
This chapter describes the broad survey methodology of the MPHS. For information on the four labour related MPHS topics that have been conducted to date, see Chapter 22.1. Barriers and Incentives to Labour Force Participation, Chapter 22.2: Retirement and Retirement Intentions, Chapter 22.3: Work-Related Injuries, and Chapter 22.4: Qualifications and Work.
OBJECTIVES OF THE MULTIPURPOSE HOUSEHOLD SURVEY
The MPHS topics are an important part of the ABS household surveys program, which aims to:
The information requirements of MPHS topics are determined on the basis of submissions from users on their needs for, and uses of, household survey data. They also reflect ABS deliberations on what is required of a national statistics program in the various subject fields, based on user contact and consultation.
The MPHS is a flexible multi-topic survey vehicle, which is used to collect and output data in a timely fashion. The MPHS includes a number of topics that require personal interview (rather than using the any responsible adult (ARA) method), and are therefore unsuited to the monthly supplementary survey program. The MPHS has a shorter development and output time than the special social surveys to achieve flexibility in responding to user demands as they arise, and to allow the ABS to respond to emerging demand and contemporary priorities in a timely way (publications are usually available within six months of the completion of data collection).
Estimates from each MPHS topic are released in separate publications. Table Builder outputs or expanded Confidentialised Unit Record Files (CURFs) are made available from each MPHS via the Remote Access Data Laboratory (RADL) or the ABS DataLab. Information on microdata access can be found on the ABS website.
As with the LFS the scope of the MPHS is restricted to persons aged 15 years and over, and excludes:
In addition, the following persons are excluded from most MPHS topics (see Chapter 17: Methods Used in ABS Household Surveys for further information):
As indicated above, the scope of the MPHS excludes persons living in very remote parts of Australia. The exclusion of these persons is unlikely to impact on state and territory estimates, except in the Northern Territory where they account for a larger proportion of the total population.
Depending on the topic, there may be further exclusions from scope. For example, some MPHS topics collect information only from a certain population or interest group (e.g. information on retirement is collected from persons aged 45 years or over).
The MPHS is conducted as a supplement to the monthly LFS. Each month one eighth of the households in the LFS sample are rotated out of the survey. Generally, around 80% of these rotating-out households are then selected for the MPHS each month. In these households, after the LFS has been fully completed for each person in scope and coverage, a person aged 15 years and over is selected at random (based on a computer algorithm) and asked the additional MPHS topic questions in a personal interview. In cases where the MPHS topic is age sensitive, permission is sought from a parent or guardian before conducting the personal interview with a person aged 15 – 17. If permission is not given, the parent or guardian may be asked on behalf of the 15 – 17 year old, but are not asked questions relating to opinions/perceptions.
Unlike LFS which collects information from all members of the household from any responsible adult, the MPHS uses a randomly selected member of the household to answer questions about themselves.
Data are collected using Computer Assisted Interviewing (CAI), whereby responses are recorded directly onto an electronic questionnaire in a notebook during a telephone, face-to-face personal interview or online self-completion.
Data for MPHS topics are collected each month over a financial year. This reduces the impact of any seasonal effects on the data.
The MPHS uses the same sample design as the LFS, where a multi-stage probability sample design is used. The sample used in the MPHS is a subset of the LFS sample. Each month a sample of approximately 1,250 households is selected.
The size of the annual MPHS sample selected is approximately 23,000, but the response rates for the MPHS are slightly lower than for the LFS. The number of fully responding households is therefore usually around 17,000. This number may be further reduced taking into account scope, coverage and sub-sampling inclusions for the selected topic. The size of the MPHS sample can be increased with user funding.
The estimation technique used for household surveys is the generalised regression estimator.
The survey is benchmarked to the estimated civilian population aged 15 years and over living in private dwellings in each state and territory in non-sparsely settled areas. The process of weighting ensures that the survey estimates conform to person benchmarks by state, part of state, sex, age and household composition.
RELIABILITY OF THE ESTIMATES
Estimates from the MPHS are subject to both sampling and non-sampling error (see Chapter 16: Overview of Survey Methods for more detail). The relative standard errors (RSEs) for each of the survey estimates are published in shadow tables. For further information on calculating RSEs from the MPHS, see the technical notes of each publication.
A 'group jack-knife' variance estimator is used to calculate estimates of variance (see Chapter 16 for more detail).
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