The objective of the Labour Force Survey 2009 is to collect basic information on labor maket in 2009, comparable with previous annual labour force surveys, in accordance with international standards to be used since 2010. In addition, the survey will support for assessing the impacts of the global economic downturn to the labour market. It was expected that the data taken from the survey would represent to the national level, urban/rural, six socialeconomic zones as well as two main cities – Hanoi city and Hochiminh city.
Kind of Data
Sample survey data [ssd]
Unit of Analysis
The scope of the Labour Force Survey 2009 includes the following:
- Names of usual residents;
- Relationship to the head of household;
- Solar month and year of birth or Age in completed year;
- Residental registration.
Usual residents aged 15 and over:
- Movement of labourer;
- Highest technical/qualification level completed and field of training;
- Economic activity during the last 7 days:
• Kind of economic activity (employed, unemployed or economically inactive population);
• Job search, duration and mode of job search;
• Duration of unemployment and reason of unemployment;
• Employed classified by basic characteristics: occupation, industry, economic sector, status of employment, working place;
• Work experience
• Hours worked and underemployment;
• Average income
• Classification of economic sector: (formal and informal sectors).
The target universe (U) for the 2009 LFS consists of individuals aged 15 years old and over (working age population). Sampling units are households; all eligible individuals in sampled households comprise the sample for the survey. A target sample size of approximate 18,000 households is more than enough to provide reliable estimates for each of the sixteen domains.
Producers and sponsors
Department of Population and Labour Statistics - General Statistics Office
Ministry of Planning and Investment
United Nations Development Program
Financial and Technical Support
ILO DIAL Project
French Research Institute for Development (IRD)
Technical Support - Questionnaire and Sample Design
The sample size of the survey is about 18,000 households. Households were selected randomly from the list of 15% sample enumeration areas of Population and Housing Census 2009, by 2 levels:
Level 1: Selecting enumeration areas,
Level 2: Selecting household. All usual residents of these selected households were interviewed and enumerated.
Sampling domain: The 2009 Labour Force Survey (LFS) is a nationally representative survey. In addition to national-level estimates, disaggregated by urban and rural areas, the survey was designed to provide reliable estimates for sixteen domains comprised of urban and rural areas of six social-economic regions and the cities of Hanoi and Ho Chi Minh. Table 1 in the Survey Report provided as external resources shows initial sample sizes(number of sampled households) by domain.
The sample of the 2009 Labour Force Survey was drawn using a two phase design.
First phase: corresponds to the selection of the 15% census sample of the 2009 Census of Population and Housing (See Instruction No 11/VPBCÐTW-HD for sample selection in the Population and Housing Census 2009).
Second phase: consists of selecting the 7,840 sample households from the 15% census sample.
This follows the standard two stage sample design calls for:
Stage 1: Select sample of EAs. For the 2009 Labour Force Survey, the EAs are the census enumeration areas for the 2009 Census of Population and Housing (CPH). The sampling frame for stage 1 is the 15% census sample which was designed by General Statistic Office (GSO) as part of the 2009 CPH to serve as future master sampling frame for household surveys.
Stage 2: Select sample of households (subsample size) from each sample EA selected in stage 1. The households were systematically selected for each of the areas chosen in the first stage, based on the household lists of the 2009 Population and Housing Census and being updated closely to the time-point of the survey.
In the total of 18,025 households selected for the survey, only 181 households did not respond to the survey although enumerators contacted those households several times. These mainly consisted of households that were vacant during the survey period. Apart from these 181 households, the remaining households were fully contacted and interviewed by field enumerators, and the survey achieved a completeness rate of 99.0%.
The indicators to be estimated from the LFS data are based on the sampled individuals. As all eligible individuals in sampled households are included in the sample, the sampling weights are computed from inclusion probabilities of households.The final sampling weight is, in general, the base design weight adjusted by population adjustment factors and non response adjustment factors. Trimming is recommended (with caution) in cases where variation in the resulting sampling weights is high and there are extremely large values. The section on pages 68-70 of the Survey Report (provided as external resources) discusses only the derivation of the base design weights.
The final sampling weight is obtained by applying adjustment factors to the base design weights and, possibly, trimming extreme values.
Dates of Data Collection
Data Collection Mode
The work of the enumerators was closely monitored to ensure the quality of the data collection. The monitoring work was mainly conducted by team leader through assigning the work and following up daily enumeration progress, observing interviews and conducting random spot checks by visiting selected households. For the duration of fieldwork, statistics staff of district, provincial level and the General Statistics Office undertook field missions to supervise and check the data collection of teams of enumeration.
Data Collection Notes
The Department of Population and Labour Statistics of the General Statistics Office undertook the preparation and implementation of the survey. This included the sample design and preparation of enumeration areas, preparation of questionnaires and related documents, setting up the survey’s plan, recruitment and training
of field workers, supervision and control of field work.
The training of fieldworkers was conducted in two stages;
First stage – the General Statistics Office trained Provincial Statistics Offices for 4 days;
Second stage - Provincial Statistics Offices trained enumerators and team leaders (supervisors) for 5 days, including one day for field practice.
In order to get information, Provincial Statistics Offices organized and established teams of enumeration; one team included 01 team leader and 04 enumerators (See Appendix 2 available in report provided as external resources). After being trained, teams of enumeration carried out the field operation of the survey for 20 days, beginning from 15th September, 2009.
The content of the survey was designed into 2 questionnaires. The Household Schelude collected information on individual characteristics of population and the Individual Questionnaire was for those 15 and over to collect detailed information on economic characteristics of labour force.
The data entry and data processing was carried out by the Department of Population and Labour Statistics collaborating with the Center of Statistics Informatics. In the questionnaire, there were questions on occupation and industry, and the coding of these questions was assigned to the Provincial Statistics Offices (PSO). The coding was done in combination with the checking of questionnaires by PSOs as long as a requirement that provincial staff had to check 100% of the completed questionnaires before handing over the General Statistics Office. Here, a number of consistency checks of data were undertaken, using software developed to attach at the computer’s data processing system.
Use of the dataset must be acknowledged using a citation which would include:
- the Identification of the Primary Investigator
- the title of the survey (including country, acronym and year of implementation)
- the survey reference number
- the source and date of download
The user of the data acknowledges that the original collector of the data, the authorized distributor of the data, and the relevant funding agency bear no responsibility for use of the data or for interpretations or inferences based upon such uses.