Summary of achieved sample size
The achieved sample size for the UK Labour Force Survey (LFS) during Quarter 1 (Jan to Mar) 2020 was 77,903 individuals in 33,329 households. Please note that there were no NHS households in this period. Compared with the previous quarter, Quarter 4 (Oct to Dec) 2019, this represents a decrease of 7.3% in household interviews and a decrease of 7.3% in achieved person interviews.
Summary of response rates
Historical reports can also be accessed.
In Quarter 1 2020, main response rates were as follows:
response rates presented in this report cover the January to March 2020 survey period; Coronavirus (COVID-19) social distancing measures were implemented towards the end of the quarter and information about this has been added to the report
the total response rate for Great Britain excluding imputed cases (Table 2) was 36.2%; this is down 2.3 percentage points on the previous quarter
the response rate excluding imputed cases (Figure 3) was 45.2% in Wave 1 and 30.4% in Wave 5; this compares with 53.8% and 30.9% respectively in the previous quarter
the total response rate for Great Britain including imputed cases (Table 3) was 43%, down 2.5 percentage points on the previous quarter
of non-response in Quarter 1 2020 (Figure 5), non-contacts made up 18.3% (up 3.6 percentage points on the previous quarter), circumstantial refusals were 11.2% (up 2.4 percentage points from the previous quarter), outright refusals were 52% (down 4.9 percentage points on the previous quarter) and other refusals made up the remainder
the region with the highest accumulated response rate across the five waves (Table 6) was West Yorkshire (50%); the lowest was Outer London (35.4%)
the overall proxy response rate (Table 7) was 32.5%; the highest proxy response rates occur in the 16 to 17 years age group (90.2%), in males (37.2%) and in the non-white ethnicity group (41.5%)
the average income response rate (Table 8) was 83.1%
the data on attrition rates are shown in Table 9; these data reveal in percentage change terms that those who drop out of the survey between Waves 1 and 5 are over-represented in the 20 to 29 years age bands, in the unemployed, in households with six or more people, and among those living in Inner London
the weekly breakdown of response (Figure 4) shows a noticeable decline in response in the week commencing 9 March 2020, with Wave 1 being impacted more than the follow-up waves; more information on how data collection was managed following the coronavirus (COVID-19) pandemic can be found in Section 2 Impact of Coronavirus (COVID-19) on the Labour Force Survey
There have been a number of methodological and operational changes that may have affected response rates. More details on these changes are outlined in Section 8 Comparability.Back to table of contents
(The degree to which the statistical product meets user needs for both coverage and content.)
The primary purpose of the Labour Force Survey (LFS) is “the prompt publication of key aggregate, whole economy, indicators, for the integrated assessment of labour market conditions” (Review of the Labour Force Survey, Office for National Statistics (ONS), 2002). The labour market covers all aspects of people’s work, including the education and training needed to equip them for work, the jobs themselves, job-search for those out of work, and income from work and benefits.
Users and uses
Users of LFS data often combine them with related data from other sources to provide an overall view of the state of the labour market. One of the most important users of this sort of assessment is the Bank of England’s Monetary Policy Committee, which sets interest rates to meet the government’s inflation target.
Other important users of LFS data are HM Treasury and the Department for Work and Pensions. Because they are responsible for UK economic and labour market policy, they are interested in a variety of indicators of the state of the labour market, including the number of people in employment, the number of hours worked and the number of unemployed people (defined according to the International Labour Organization (ILO)). They often analyse these series by age groups, by regions and by sex. Other government users include the Department for Business, Energy and Industrial Strategy (BEIS); the Home Office; the Health and Safety Executive; the Scottish Government; and the Welsh Government.
At the international level, LFS data are used by the European Parliament; Council and Commission; the European Central Bank; and Directorate-General for Employment, Social Affairs and Inclusion (DG Employment). They are also used by the Organisation for Economic Co-operation and Development (OECD) and the ILO.
Other users include local authorities; the Trades Union Congress (TUC); the Employer’s Association; the Confederation of British Industry; the Institute of Employment Studies; the Institute for Public Policy Research; the National Institute of Economic and Social Research; the Policy Studies Institute; the Institute for Fiscal Studies; academic researchers; the media; and the general public.
Strengths and limitations
The main strengths of the LFS include:
- it has the largest coverage of any household survey in the UK and can therefore generate statistics for small geographical areas
- the sampling errors are relatively small, as a result of the wave structure and the size of the survey
- the survey covers a large range of employment-related variables and non-employment-related variables, allowing cross-linking analyses to be undertaken (for example, earnings against educational attainment)
The main limitations of the LFS include:
- the sample design provides no guarantee of adequate coverage of any industry, as the survey is not industrially stratified
- the LFS coverage omits communal establishments, except NHS housing and students in halls of residence and at boarding schools; members of the armed forces are only included if they live in private accommodation and workers aged 16 years and under are not covered
The definitions of the three economic activity groups – employed, unemployed and economically inactive – that are used in the LFS are the standard ILO definitions. It should be noted that although the LFS uses ILO definitions, these definitions are not interpreted and applied in exactly the same way in different countries. For example, although “working age” is a common term, different countries have different statutory school leaving and retirement ages. However, Eurostat collects data from member states and adjusts them to produce comparable estimates.
(The closeness between an estimated result and the (unknown) true value.)
The main threats to accuracy are sources of error, namely sampling error and non-sampling error, where non- sampling error includes:
- coverage error
- non-response error
- measurement error
- processing error
- model assumption error
Many of the sources of non-sampling error are difficult to measure. However, the LFS publishes detailed response rates for all waves of the survey and an overall response rate, including time series (Tables 2 to 5 and Figures 3 and 4). Response rates are also published by government region for each wave during the particular quarter (Table 6). The LFS also publishes proxy response rates (Table 7), response rates for income questions by National Statistics Socio-economic Classification (NS-SEC) (Table 8), and attrition rates (Table 9).
Surveys, such as the LFS, provide estimates of population characteristics rather than exact measures. In principle, many random samples could be drawn and each would give different results, owing to the fact that each sample would be made up of different people, who would give different answers to the questions asked. The spread of these results is the sampling variability, which generally reduces with increasing sample size. A confidence interval is a range of values, defined by a lower and upper bound, that indicates the variability of an estimate. Statistical methods are used to calculate the sampling variability from which the confidence interval can be determined. For example, with a 95% confidence interval, it is expected that in 95% of the survey samples, the resulting confidence interval will contain the true value that would be obtained by surveying the whole population.
The LFS routinely publishes details of achieved sample sizes in terms of achieved number of household and person interviews (Table 1 and Figures 1 and 2) and sampling variability for estimates of main variables. Sampling variability (95% confidence intervals) can be found in the Sampling variability section (Dataset A11) of the Labour market statistical bulletin.Back to table of contents
|Individuals in private households||71,105||57,783||77,903||64,158|
|Individuals in NHS households||0||0||0||0|
Download this table Table 1: Achieved sample by type of household, January to March 2020.xls .csv
Back to table of contents
|Wave 1 in|
|Wave 2 in|
|Wave 3 in|
|Wave 4 in|
|Wave 5 in|
found at selected units
|Addresses not issued|
Download this table Table 2: Wave specific response rates, excluding imputed households, Great Britain, January to March 2020.xls .csv
|Wave 1 in|
|Wave 2 in|
|Wave 3 in|
|Wave 4 in|
|Wave 5 in|
found at selected units
|Refusal to HQ||694||4.4||822||5.7||832||5.8||831||5.9||965||6.7||4,144||5.7|
|Addresses not issued|
Download this table Table 3: Wave specific response rates, including imputed households , Great Britain, January to March 2020.xls .csv
|Wave 1 in|
|Wave 2 in|
|Wave 3 in|
|Wave 4 in|
|Wave 5 in|
found at selected units
|Refusal to HQ||730||4.4||825||5.3||833||5.4||832||5.6||966||6.3||4,186||5.4|
|Addresses not issued|
Download this table Table 4: Wave specific response rates, excluding imputed households, UK, January to March 2020.xls .csv
|Wave 1 in||Wave 2 in||Wave 3 in||Wave 4 in||Wave 5 in||Total|
found at selected units
|Refusal to HQ||730||4.4||825||5.4||833||5.4||832||5.6||966||6.3||4,186||5.4|
|Addresses not issued|
Download this table Table 5: Wave specific response rates, including imputed households, UK, January to March 2020.xls .csv
|Wave 5 |
|Tyne & Wear||45.1||51.8||47.3||45.2||31.6||44.3|
|Rest of North East||51.7||55.2||51.5||42.6||40.1||48.2|
|Rest of North West||50.8||52.3||44.6||36.7||36.2||44.3|
|Rest of Yorkshire and|
|Rest of West Midlands||52.3||51.2||46.8||40.8||39.0||46.1|
|East of England||45.4||51.3||48.2||36.3||38.1||43.9|
|Rest of Scotland||47.3||46.7||44.3||38.2||38.8||43.2|
Download this table Table 6: Wave specific response rates, including imputed households, by region, January to March 2020.xls .csv
|Age||Total (16 years and over)||56,128||18,250||32.5|
|16 to 17 years||1,586||1,431||90.2|
|18 to 19 years||1,359||1,054||77.6|
|20 years and over||53,183||15,765||29.6|
|Unpaid family workers||129||21||16.3|
Download this table Table 7: Proxy response, Great Britain, January to March 2020.xls .csv
|Wave 1 in JM20||Wave 5 in JM20||Total|
|Higher managerial and professional||84.4||86.8||85.4|
|Lower managerial and professional||85.2||85.8||85.5|
|Small employers and own account workers||85.7||100.0||90.9|
|Lower supervisory and technical||81.9||80.6||81.4|
Download this table Table 8: Income response rates by NS-SEC, Great Britain, January to March 2020.xls .csv
|Age||under 16 years||22.1||19.3||14.8||23.9|
|16 to 19 years||4.3||3.2||2.3||5.0|
|20 to 29 years||11.4||7.7||6.0||13.8|
|30 to 39 years||14.4||12.6||9.7||15.5|
|40 to 49 years||13.0||11.5||10.1||13.9|
|50 to 59 years||14.5||15.8||16.7||13.8|
|60 to 69 years||12.4||17.2||21.7||9.3|
|70 years and over||8.0||12.8||18.7||4.8|
|UPFW (Unpaid Family Workers)||0.2||0.3||0.4||0.2|
|Number of people|
|6 or more||5.9||3.5||2.1||7.5|
|Region||Tyne & Wear||1.5||1.6||1.0||1.5|
|(GOVTOR)||Rest of North East||2.7||2.7||2.7||2.6|
|Rest of North West||5.0||5.0||4.6||5.0|
|Rest of Yorkshire and Humberside||3.0||3.3||3.5||2.9|
|West Midlands Metropolitan Council||4.3||3.8||3.9||4.6|
|Rest of West Midlands||5.1||5.3||5.3||5.0|
|East of England||10.0||11.0||11.8||9.3|
|Rest of Scotland||5.1||5.9||5.5||4.6|
Download this table Table 9: Summary of attrition by main characteristics, Great Britain, January to March 2020.xls .csv
(Timeliness refers to the lapse of time between publication and the period to which the data refer. Punctuality refers to the time lag between the actual and planned dates of publication.)
To the Office for National Statistics (ONS) Labour Market Division (LMD)
- scheduled delivery date for file: 17 April 2020
- achieved delivery date for file: 20 April 2020
- time lag between achieved delivery date and the end of the reference period: 20 days
Data file for other users
Scheduled availability date for regional public and government normal release user files: 19 May 2020
- Bank of England
- Department for Business, Energy and Industrial Strategy
- Ministry for Housing, Communities and Local Government
- Department for Education
- Department for Enterprise, Trade and Investment (Northern Ireland)
- Department for Digital, Culture, Media and Sport
- Department for Transport
- Department for Work and Pensions
- Department of Finance and Personnel (Northern Ireland)
- Economic and Social Research Council and Data Archive
- Health and Safety Executive
- HM Treasury
- Home Office
- Low Pay Commission
- Office for Standards in Education
- Office of Manpower Economics
- Scottish Government and Scottish Executive
- Small Business Service
- Welsh Government
(Accessibility is the ease with which users are able to access the data, also reflecting the format(s) in which the data are available and the availability of supporting information. Clarity refers to the quality and sufficiency of the metadata, illustrations and accompanying advice.)
The UK Data Archive at the University of Essex provides free access to the various Labour Force Survey (LFS) datasets.
NOMIS provide a free but highly disaggregated dataset, which covers a wealth of data for local areas.
Labour market data, including data from the LFS, are published every month through statistical bulletins. These include text, tables and charts. Data contained within the bulletins are available to download, free of charge.
For questions relating to labour market statistics, please contact firstname.lastname@example.org
For general queries about the LFS, please contact email@example.comBack to table of contents
(Comparability is the degree to which data can be compared over time and domain.)
The Labour Force Survey (LFS) began in 1973 and was carried out every two years until 1983. Between 1984 and 1991, data were collected annually, and the survey has been running in its present form, with quarterly sampling, since spring 1992. It is carried out under EU regulations, which specify the way the survey should be conducted, the quality of the results that member states supply to Eurostat and the timetable for supplying results. Although the LFS began as a survey designed to meet international obligations, its primary purpose is now “the prompt publication of key aggregate, whole economy, indicators, for the integrated assessment of labour market conditions” (Review of the Labour Force Survey, Office for National Statistics, 2002).
The definitions of the three economic activity groups – employed, unemployed and economically inactive – that are used in the LFS are the standard International Labour Organization (ILO) definitions. These include:
economically active – those aged 16 years and over, who are either employed or unemployed in the survey reference week.
employed – those aged 16 years and over, who are regarded as in employment if they did at least one hour of work in the reference week (as an employee, self-employed, unpaid workers in a family business or participants in government-supported training schemes) and those who had a job that they were temporarily away from (for example, if they were on holiday).
unemployed – those aged 16 years and over, who are without work, want a job, have actively sought work in the last four weeks and are available to start work in the next two weeks, or are out of work but have found a job and are waiting to start it within the next two weeks.
economically inactive – those who are neither in employment nor unemployed. This group includes, for example, all those who are looking after a home or family, have a long-term illness or disability that prevents them working, or are retired.
unpaid family workers – those who are doing unpaid work in a family business.
January to March 2020 questionnaire changes
Job quality (JobPro Jobrep)
Eurostat adhoc module ANYACC, INJURY, INJNO, EROAD, JOB1, RESACT, STWRK1, OFFWRK, EHEALTH, WORSE, HEALSNO, SERIOS, EAFFECT, LIMIT, JOB2, RESHLT, STWRK2, TIMOFF, FACTR, FACTRM, MENTL, MENTLM.
Quarterly specific questions
- Accidents at work - ACCDNT ROAD, WCHJB, GOBCK9, TIMEDAYS, TIMECODE, TYPINJ, SITEFR, SITEDI, ACCURH, ACCKIND, ILLWRK, NUMILL, TYPILL, AWARE, TMEOFF, ILCURR, WCHJB3, REASOFF9, NOBACK9
- Training - EDIns11, TSTE10, TFEE10, TrnLen
- Full time or part time and availability to start work - AXPB, AXFB, FWkWen
- Internet use – INTUSE
- Health (Heal20, Health20, HealPB20)
- Illness (Illne20, Illfst20, Illnxt20)
- Hours (Yless20, YPayL20)
- Hours (Flex10 – coverage changed, question now asked on all waves of the survey)
Fieldwork and operational changes
A timeline of significant operational changes that may have had an impact on response include:
July 2010 – households with residents aged 75 years and over are removed after their initial interview from Quarter 3 (July to Sept) 2010; this affects response rates, as these households generally have high response rates
January 2011 – a proportion of initial interviews were conducted by the telephone unit rather than face-to-face as an efficiency measure
June 2017 – introduction of £5 and £10 incentives randomly allocated across the sample
January 2018 - from Quarter 1 (Jan to Mar) 2018 onwards all initial interviews have been face-to-face, except for respondents north of the Caledonian Canal (NOCC)
January 2018 – around 10 to 15% of the Wave 1 sample moved from telephone operations to face-to-face
April 2018 – introduction of new administrative systems for recording field time and expenses
June 2018 – changes to advance materials and procedures due to the introduction of the General Data Protection Regulation (GDPR)
July 2018 – change of incentive type from a paper voucher to a card voucher
October 2018 – launch of a new fieldwork management tool for use in face-to-face mode
March 2019 – issues with the telephone system used for some cases in Waves 2 to 5 resulted in poor connectivity, which may affect response rates
March 2020 - social distancing measures were implemented in the UK; face-to-face data collection paused and all interviewing moved to telephone mode; see Section 2 Impact of Coronavirus (COVID-19) on the Labour Force Survey for more information
Survey methodology changes
Changes to State Pension age were introduced in 2010, which affected labour market and LFS publications as well as other social surveys. Under the Pensions Act 2011, the State Pension age of women was expected to increase more quickly (than originally planned) to age 65 years between April 2016 and November 2018. From December 2018, the State Pension age for both men and women started to increase and it is expected to reach age 66 years by October 2020.
From Quarter 3 (July to Sept) 2010, households that only contain respondents aged 75 years and over are removed from the sample after their Wave 1 interview. This change was introduced to reduce the cost of the survey and reduce the burden on respondents. Households only containing individuals aged 75 years and over are largely economically inactive. Therefore, the value of interviewing these households is greatly reduced when considering the main aims of the LFS. The Wave 1 interviews from households aged 75 years and over will receive a larger weight to make them representative of the UK population. This change results in around a 10% reduction in the household sample size and a 7% reduction in the individual sample size.
From Quarter 3 2010, the treatment of “concealed multi-households” on the LFS has also changed. Previously, if one sampled address turned out on inspection to be, for example, not one house but six flats, all six flats would be recorded as households and interviews would be attempted with each household. The number of households encountered could be in the hundreds. This was not be a practical approach. We decided to harmonise the approach to multi-households across all our social surveys. From Quarter 3 2010, if a concealed multi-household is recorded, only one household will be randomly selected to be interviewed.Back to table of contents
(Coherence is the degree to which data that are derived from different sources or methods, but that refer to the same phenomenon, are similar.)
The Labour Force Survey (LFS) is one of a number of sources of data about the labour market. Some sources provide data that overlap with LFS data on employment, unemployment and earnings. The Office for National Statistics (ONS) has published guidance about the strengths and limitations of each source in relation to these topics and has indicated which source is the most appropriate for different purposes. Details can be found in the Labour market statistics guide.
Employment, unemployment and economic inactivity
The LFS is the source recommended by the ONS for certain employment-related statistics (for example, estimates of the number of people in employment or unemployed). The LFS is also a unique source of comprehensive, coherent information about economic inactivity, where it provides information separately about people who want a job and those who do not.
Number and industrial composition of jobs
The workforce jobs (WFJ) series provides estimates of the number of jobs in the UK economy and is the source recommended by the ONS for both the number of jobs and the industrial composition of jobs. Workforce jobs consist of the sum of employee jobs, self-employment jobs, jobs in the armed forces and government-supported trainees. Civilian workforce jobs are available by geographical region, sex and broad industry. Total workforce jobs are available by sex and broad industry.
For estimates of change in earnings (for example, pay growth in the economy), a non-LFS source, the Average Weekly Earnings (AWE) measure (formerly the Average Earnings Index (AEI)), is the most suitable source. It provides industry and whole-economy information but excludes small employers, the self-employed and government-supported trainees. Pay, commission, bonuses, overtime and pay award arrears are included, but redundancy payments and benefits in kind are excluded.
The Annual Survey of Hours and Earnings (ASHE) includes information about the levels, distribution, and make-up of earnings and hours worked for employees in different occupations, industries, ages and regions. It should be used when the information required is not available from the AWE (such as for occupational groups, or regional analyses) and is the preferred source of the earnings of full-time employees and of the average hourly earnings of all employees. The LFS should be used when the information is not available from the AWE or from the ASHE and is the preferred source of data about the earnings of part-time and low-paid employees. There is an ONS guide to sources of data on earnings and income.Back to table of contents
The Labour Force Survey (LFS) covers private households, including persons who are temporarily absent. The resident population is made up of persons who regard the sample address as their main address and those who have lived in the dwelling for more than six consecutive months, even if they do not regard this as their principal dwelling. Persons absent for more than six months are not regarded as members of the resident population.
A private household comprises of one or more persons (not necessarily related) living at the same address who share cooking facilities and share a living room, sitting room or dining area. Students living in halls of residence and pupils at boarding schools are sampled through the private households of their parents. In Great Britain, an additional sample is drawn from persons living in NHS accommodation
The year is divided into quarters of 13 weeks. Prior to January 2006, these were seasonal quarters:
- winter (December to February)
- spring (March to May)
- summer (June to August)
- autumn (September to November)
From January 2006, the LFS has been conducted based on calendar quarters:
- Quarter 1 – January to March
- Quarter 2 – April to June
- Quarter 3 – July to September
- Quarter 4 – October to December
For most of Great Britain, the survey base is the Royal Mail’s Postcode Address File (PAF), a database of all addresses receiving mail. The list is limited to addresses receiving fewer than 25 items of post per day, to exclude businesses. Because of the very low population density in the far north of Scotland (north of the Caledonian Canal), telephone directories are used as sampling frames. Interviews in the far north of Scotland are also carried out by telephone because face-to-face interviews would be too expensive. In Northern Ireland, Pointer, which is the government’s central register of domestic properties, is used.
In Great Britain, a systematic sample is drawn each quarter from the three sampling bases, yielding 16,640 PAF addresses, 75 telephone numbers for the north of Scotland and 36 units of NHS housing. As the PAF is broken down geographically, the systematic sampling ensures that the sample is representative at regional level. In Northern Ireland, a simple random sample is drawn, each quarter, from each of three strata, giving 650 addresses in all.
A rotation system made up of five waves is used. Respondents are interviewed five times at 13-week intervals and one-fifth of the sample is replaced each quarter. Interviews are carried out on a face-to-face (CAPI) or telephone (CATI) basis with the help of portable computers for the interviews in the first wave. In the far north of Scotland (north of the Caledonian Canal) and for interviews in the second to fifth waves, wherever possible, interviews are carried out by telephone.Back to table of contents
If a household (or someone within a household) is unavailable for interview but was interviewed in the previous wave, responses from the previous wave are rolled forward. This is referred to as “imputation”. Imputation is carried out to minimise non-response bias in estimates while simultaneously improving precision by boosting the sample size. The rationale is that most Labour Force Survey (LFS) variables do not change from one quarter to another for most people.
Responses are rolled forward for one wave only. Data are not rolled forward after a second consecutive non- response. Tables and charts (at person or household level) containing responses that have been rolled forward from the previous wave are denoted by the term “including imputed”. Tables and charts that do not contain responses that have been rolled forward from the previous wave are denoted by the term “excluding imputed”.
Method of calculating sampling variability
See Section 3 Summary of quality for information on the method of calculating sampling variability.
Method of calculating response rates
The response rate indicates how many interviews were achieved as a proportion of those eligible for the survey. The formula used is:
RR equals (FR plus PR) divided by (FR plus PR plus OR plus CR plus RHQ plus NC plus RRI*)
where RR is response rate, FR is full response, PR is partial response, OR is outright refusal, CR is circumstantial refusal, RHQ is refusal to HQ, NC is non-contact, RRI is refusal to re-interview, and the asterisk (*) applies to Waves 2 to 5 only.
Definitions of response outcome categories
Full response – a household in which each household member has answered all applicable questions.
Partial response – a household in which questions were not completed because someone refused to be interviewed, refused part way through the questionnaire, or refused to let someone else answer on his or her behalf. However, at least one question block must have been completed. If only part of the information has been collected for a one-person household, it is coded as a refusal or non-contact.
Outright refusal – a household that refuses to respond to the survey and the interviewer feels that there is no chance of an interview at the current or in any future wave.
Circumstantial refusal – a household where the respondent refuses to respond because of a temporary circumstance (for example, going on holiday or being too busy during the field period). A circumstantial refusal enables an interviewer to call back at the next wave.
Refusal to HQ – a household that contacts headquarters to refuse to participate in the survey in response to the advance letter.
Non-contact – when an address is occupied, but where it has not been possible to contact any member of the household in the field period.
Refusal to re-interview – a household that takes part in the survey (at one or more of Waves 1 to 4) but that, when asked to take part in the next wave (Waves 2 to 5), refuses.
Method of calculating income response rates
The income question is asked at Waves 1 and 5 only. Individuals aged 16 to 69 years who are in employment in the reference week form the sub-set of respondents who are eligible for these questions. The percentage response rates for the income questions are based on all eligible, in-scope respondents at Wave 1 and all eligible, in-scope respondents at Wave 5. The total response rate is the aggregate response rate for income for the quarter (Wave 1 and Wave 5), based on all eligible, in-scope respondents.
National Statistics Socio-economic Classification (NS-SEC)
The National Statistics Socio-economic Classification (NS-SEC) replaces previous classifications that were based on social class and social and economic group.
The LFS has to complete fieldwork to a tight timetable and interview as many of the sampled households as possible, which leaves limited time for recalls. LFS interviewers try to interview every adult (aged 16 years and over) in each sampled household. However, when a household member is unavailable for interview, interviewers accept information by proxy from another responsible adult in the household. The proxy respondents are normally people living with a partner on behalf of their partner and parents on behalf of their adult offspring who live with them.
Attrition is the term applied to respondents who begin the survey but subsequently drop out. It has been known for some time that these respondents tend to have different characteristics to those who remain in all waves of the survey, which can, therefore, result in attrition bias. For example, if respondents in a particular age group have a higher tendency to drop out (attrition rate) than respondents in other age groups, then they will be under-represented in subsequent waves of the survey and in estimates.Back to table of contents