Labour Force Survey 2004, September - South Africa

Abstract
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The LFS is a twice-yearly rotating panel household survey, specifically designed to measure the dynamics of employment and unemployment in South Africa. It measures a variety of issues related to the labour market,including unemployment rates (official and expanded), according to standard definitions of the International Labour Organisation (ILO).

All editions of the LFS have been updated (some more than once) since their release. These version changes are detailed in a document available from DataFirst (in the "external documents" section titled "LFS 2000-2008 Collated Version Notes on the South African LFS").

Geographic coverage
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National Coverage

Analysis unit
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Households (dwellings) and individuals

Universe
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The LFS sample covers the non-institutional population except for workers' hostels. However, persons living in private dwelling units within institutions are also enumerated. For example, within a school compound, one would enumerate the schoolmaster's house and teachers' accommodation because these are private dwellings. Students living in a dormitory on the school compound would, however, be excluded.

Kind of data
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Sample survey data [ssd]

Sampling procedure
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Statistics South Africa uses a rotating panel methodology for the labour force survey. The rotating panel methodology involves visiting the same dwelling units on a number of occasions (in this instance, five at most). After the panel is established, a proportion of the dwelling units is replaced each round (in this instance, 20%). New dwelling units are added to the sample to replace those that are taken out.

Enumeration Areas (EAs) that had a household count of less than twenty-five were omitted from the census 2001 frame that was used to draw the sample of Primary Sampling Units (PSUs) for the new Master Sample. Other omissions from the Master Sample frame included all institution EAs except workers, hostels, convents and monasteries. EAs from census 2001 were pooled in two stages, before and after sampling. Before sampling the criterion that was used to pool EAs was that they should contain a minimum of one hundred households. However, during listing it was discovered that there were discrepancies between the information on the database and what was on the ground.

Therefore, in the second stage of pooling, EAs that were found to have less than sixty dwelling units during listing were pooled. The Master Sample is a multi-stage stratified sample. The overall sample size of PSUs was 3000. The explicit strata were the 53 district councils/metros (DCs). The 3000 PSUs were allocated to these DCs using the power allocation method. The PSUs were then sampled using probability proportional to size principles. The measure of size used was the number of households in a PSU as calculated in the census. The sampled PSUs were listed with the dwelling unit as the listing unit. From these listings systematic samples of dwelling units per PSU were drawn. These samples of dwelling units form clusters. The size of the clusters differs depending on the specific survey requirements. The LFS uses one of the clusters that contain ten dwelling units.

Mode of data collection
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Face-to-face [f2f]

摘要
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LFS（劳动力调查）是一项每半年进行一次的轮换样本家庭调查，旨在精确测量南非的就业与失业动态。该调查涵盖了与劳动力市场相关的诸多问题，包括官方和扩展的失业率，这些指标均遵循国际劳工组织（ILO）的既定定义。

自发布以来，所有版本的LFS都进行了更新（某些版本更新不止一次）。这些版本变更的详细信息可在DataFirst提供的文档中找到，文档标题为“LFS 2000-2008 汇总版南非LFS版本说明”，位于“外部文件”部分。

地理覆盖范围
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全国覆盖

分析单元
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家庭（住宅）和个人

总体
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LFS样本涵盖了非机构人口，不包括工人宿舍。然而，生活在机构内私人住宅单位内的人员也被纳入统计。例如，在学校园区内，应统计校长住宅和教师宿舍，因为这些是私人住宅。然而，居住在学校园区宿舍的学生则被排除在外。

数据类型
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样本调查数据 [ssd]

抽样程序
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南非统计局采用轮换样本方法进行劳动力调查。轮换样本方法涉及多次访问相同的住宅单位（在本例中最多五次）。在建立样本后，每轮都会更换一部分住宅单位（在本例中为20%）。新的住宅单位被添加到样本中，以替代那些被移除的单位。

人口普查2001中家庭数量少于二十五的普查区域被排除在用于抽取初级抽样单位（PSU）的样本框架之外。除了工人、宿舍、修道院和寺院之外，所有机构的普查区域也被排除在主样本框架之外。2001年的人口普查区域在两个阶段进行了合并，即在抽样之前和之后。在抽样之前，合并普查区域的准则是它们应至少包含一百个家庭。然而，在登记过程中发现，数据库中的信息与实际情况之间存在差异。

因此，在合并的第二阶段，那些在登记过程中发现住宅单位数量少于六十的普查区域被合并。主样本是一个多阶段分层样本。PSU的总样本量为3000。显式的分层是53个区议会/大都市（DC）。3000个PSU被分配给这些DC，采用幂分配方法。然后，使用与规模成比例的概率原则对PSU进行抽样。使用的规模衡量标准是在人口普查中计算的PSU家庭数量。从这些列表中抽取了每个PSU的住宅单位系统样本。这些住宅单位的样本形成集群。集群的大小取决于具体的调查要求。LFS使用包含十个住宅单位的其中一个集群。

数据收集方式
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面对面 [f2f]