Labour Force Survey Two-Quarter Longitudinal Dataset, January - June, 2015

<div><span style="font-style: italic;">Latest Edition Information</span></div><div>For the fourth edition (July 2019) a new version of the data file, weighted to 2018 population figures, was deposited.</div> <b>Background</b><br> The <i>Labour Force Survey</i> (LFS) is a unique source of information using international definitions of employment and unemployment and economic inactivity, together with a wide range of related topics such as occupation, training, hours of work and personal characteristics of household members aged 16 years and over. It is used to inform social, economic and employment policy. The LFS was first conducted biennially from 1973-1983. Between 1984 and 1991 the survey was carried out annually and consisted of a quarterly survey conducted throughout the year and a 'boost' survey in the spring quarter (data were then collected seasonally). From 1992 quarterly data were made available, with a quarterly sample size approximately equivalent to that of the previous annual data. The survey then became known as the <i>Quarterly Labour Force Survey</i> (QLFS). From December 1994, data gathering for Northern Ireland moved to a full quarterly cycle to match the rest of the country, so the QLFS then covered the whole of the UK (though some additional annual Northern Ireland LFS datasets are also held at the UK Data Archive). Further information on the background to the QLFS may be found in the documentation.<br> <br> <b>Longitudinal data</b><br> The LFS retains each sample household for five consecutive quarters, with a fifth of the sample replaced each quarter. The main survey was designed to produce cross-sectional data, but the data on each individual have now been linked together to provide longitudinal information. The longitudinal data comprise two types of linked datasets, created using the weighting method to adjust for non-response bias. The two-quarter datasets link data from two consecutive waves, while the five-quarter datasets link across a whole year (for example January 2010 to March 2011 inclusive) and contain data from all five waves. A full series of longitudinal data has been produced, going back to winter 1992. Linking together records to create a longitudinal dimension can, for example, provide information on gross flows over time between different labour force categories (employed, unemployed and economically inactive). This will provide detail about people who have moved between the categories. Also, longitudinal information is useful in monitoring the effects of government policies and can be used to follow the subsequent activities and circumstances of people affected by specific policy initiatives, and to compare them with other groups in the population. There are however methodological problems which could distort the data resulting from this longitudinal linking. The ONS continues to research these issues and advises that the presentation of results should be carefully considered, and warnings should be included with outputs where necessary.<br> <br> <b>LFS Documentation</b><br> The documentation available from the Archive to accompany LFS datasets largely consists of the latest version of each user guide volume alongside the appropriate questionnaire for the year concerned. However, volumes are updated periodically by ONS, so users are advised to check the latest documents on the ONS <a href="https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/methodologies/labourforcesurveyuserguidance" title="Labour Force Survey - User Guidance">Labour Force Survey - User Guidance</a> pages before commencing analysis. <b>This is especially important for users of older QLFS studies, where information and guidance in the user guide documents may have changed over time.</b><br> <br> <b> Additional data derived from the QLFS</b><br> The Archive also holds further QLFS series: End User Licence (EUL) quarterly data; Secure Access datasets; household datasets; quarterly, annual and ad hoc module datasets compiled for Eurostat; and some additional annual Northern Ireland datasets. <br> <br> <b>Variables DISEA and LNGLST</b><br> Dataset A08 (Labour market status of disabled people) which ONS suspended due to an apparent discontinuity between April to June 2017 and July to September 2017 is now available. As a result of this apparent discontinuity and the inconclusive investigations at this stage, comparisons should be made with caution between April to June 2017 and subsequent time periods. However users should note that the estimates are not seasonally adjusted, so some of the change between quarters could be due to seasonality. Further recommendations on historical comparisons of the estimates will be given in November 2018 when ONS are due to publish estimates for July to September 2018. <br> <br> An article explaining the quality assurance investigations that have been conducted so far is available on the <a href="https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/methodologies/analysisofthediscontinuityinthelabourforcesurveydisabilitydataapriltojune2017tojulytoseptember2017" target="_blank">ONS Methodology</a> webpage. For any queries about Dataset A08 please email [e-mail].<br> <br>

<div><span style="font-style: italic;">最新版本信息</span></div><div>2019年7月发布的第四版中，已存档一份适配2018年人口统计数据加权后的新版数据文件。</div> <b>背景</b><br> 该<i>劳动力市场调查（Labour Force Survey, LFS）</i>是采用国际通用就业、失业及经济非活动定义的独特信息来源，覆盖职业、培训、工作时长以及16岁及以上家庭成员的个人特征等诸多相关主题，可用于支撑社会、经济与就业政策的制定。该调查最初于1973年至1983年间每两年开展一次；1984年至1991年改为年度调查，由全年开展的季度调查与春季季度补充调查组成（此后数据按季节采集）；1992年起开始提供季度数据，季度样本量大致与此前年度调查的样本量相当，该调查也自此更名为<i>季度劳动力市场调查（Quarterly Labour Force Survey, QLFS）</i>。1994年12月起，北爱尔兰地区的数据采集也调整为全季度周期，与英国其他地区保持一致，至此QLFS覆盖全英国境内的调查（不过英国数据档案馆仍留存有额外的北爱尔兰年度LFS数据集）。关于QLFS背景的更多细节可参阅相关文档。<br> <br> <b>纵向数据</b><br> LFS会将每个样本家庭连续保留五个季度，每季度替换五分之一的样本。该调查最初设计用于生成横截面数据，但目前已将每个受访者的相关数据进行关联，以提供纵向信息。纵向数据包含两类通过加权方法调整无应答偏倚后生成的关联数据集：两季度数据集关联连续两轮调查的数据，五季度数据集则覆盖完整一年的调查周期（例如2010年1月至2011年3月，含首尾月份），包含全部五轮调查的数据。完整的纵向数据序列可追溯至1992年冬季。通过关联记录构建纵向维度，可获取不同劳动力市场分类（就业、失业及经济非活动群体）间随时间变化的总流量信息，从而详细呈现跨类别流动的受访者情况。此外，纵向数据有助于监测政府政策的实施效果，可用于追踪受特定政策举措影响的人群后续活动与境况，并与其他人口群体进行对比。不过，纵向数据关联过程中存在可能扭曲数据结果的方法学问题，英国国家统计局（ONS）仍在对此类问题开展研究，并建议对结果的呈现需谨慎考量，必要时需在输出结果中附加相关警示。<br> <br> <b>LFS文档</b><br> 档案馆配套LFS数据集的文档，主要包含各年度最新版用户指南卷与对应年度的调查问卷。但英国国家统计局（ONS）会定期对指南卷进行更新，因此建议用户在开展分析前，先前往ONS的<a href="https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/methodologies/labourforcesurveyuserguidance" title="劳动力市场调查——用户指南">劳动力市场调查——用户指南</a>页面核查最新文档。<b>对于使用旧版QLFS研究的用户而言，这一点尤为重要，因为用户指南中的信息与指引可能已随时间发生变化。</b><br> <br> <b>QLFS衍生附加数据</b><br> 档案馆还留存有其他QLFS系列数据集：最终用户许可（End User Licence, EUL）季度数据、安全访问数据集、家庭数据集、为欧洲统计局（Eurostat）编制的季度、年度及特设模块数据集，以及部分额外的北爱尔兰年度数据集。<br> <br> <b>变量DISEA与LNGLST</b><br> 此前因2017年4月至6月与2017年7月至9月间存在明显数据不连续性，英国国家统计局（ONS）暂停的数据集A08（残疾人劳动力市场状况）现已恢复可用。鉴于该数据不连续性问题及现阶段调查尚未得出定论，在比较2017年4月至6月与后续时段的数据时需格外谨慎。同时需注意，相关估算值未经过季节调整，因此季度间的部分变化可能源于季节性因素。英国国家统计局（ONS）将于2018年11月发布2018年7月至9月的估算值时，就历史估算值的比较给出进一步建议。一篇阐述目前已开展的质量保证调查的文章，可在<a href="https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/methodologies/analysisofthediscontinuityinthelabourforcesurveyydisabilitydataapriltojune2017tojulytoseptember2017" target="_blank">ONS方法学</a>网页查阅。若对数据集A08有任何疑问，请发送邮件至[e-mail].<br> <br>