Census 1991: Individual Sample of Anonymised Records for Great Britain (SARs)

<p><span style="color: rgb(50, 49, 50); font-family: "Open Sans", Helvetica, Arial, sans-serif; font-size: 14px;">The UK censuses took place on </span>21st April 1991<span style="color: rgb(50, 49, 50); font-family: "Open Sans", Helvetica, Arial, sans-serif; font-size: 14px;">. They were run by the Census Office for Northern Ireland, General Register Office for Scotland, and the Office of Population and Surveys for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.</span><br></p><p><span style="color: rgb(50, 49, 50); font-family: "Open Sans", Helvetica, Arial, sans-serif; font-size: 14px;">Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services.</span></p> The 1991 <i>Individual Sample of Anonymised Records for Great Britain</i> (SARs) represents a 2% sample of individuals enumerated in households and communal establishments in the 1991 Census. It consists of almost 1.2 million individual records. The SARs were drawn from the fully coded set of census records returned by households and institutions. They therefore omit wholly imputed households and also households that were missed by the Census. In total, 278 geographical areas are identified on the Individual SAR and include all large local authority districts with a population of at least 120,000 in the 1989 mid-year estimates. Smaller local authorities have been grouped together to form areas with populations over 120,000. <br>
<br>
The Individual SAR was selected from the 10% sample of the 1991 Census from the remaining households after the removal of the Household SAR. This ensured that there were no overlapping cases in the two samples. Individuals in the remaining households were stratified into groups of nine, and two individuals were selected from each group at random. Individuals in communal establishments were stratified into groups of five, and one individual was selected at random from each group. The records were then scrambled to prevent the geographical tracing within a SAR area. In the Individual file there are two potential sources of clustering which arise in the sampling process. First, individuals are clustered into households in the selection of the 1% sample and second, the removal of the household SAR from the 1% sample implies a further clustering into households. Nonetheless, the Individual SAR approximates to a simple random sample. <br>
<br>
Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research <a href="http://www.ccsr.ac.uk/sars/" title="Samples of Anonymised Records">Samples of Anonymised Records</a> website.<br>
<br>

英国人口普查于1991年4月21日开展，由北爱尔兰普查办公室（Census Office for Northern Ireland）、苏格兰总登记处（General Register Office for Scotland）以及英格兰和威尔士人口调查办公室（Office of Population and Surveys for England and Wales）负责实施。英国由英格兰、威尔士、苏格兰和北爱尔兰四个构成国组成。

英国人口普查统计数据有助于刻画国家全貌与国民生活图景，能够提供人口及其特征的详细快照，并为公共服务的拨款分配提供核心依据。

1991年大不列颠匿名记录个人样本集（Individual Sample of Anonymised Records for Great Britain，简称SARs）是1991年人口普查中针对家庭及集体住宿机构枚举对象的2%个体抽样数据集，共包含近120万条个体记录。该样本集源自家庭与集体住宿机构报送的全部编码完成的普查原始记录，因此剔除了全部估算补登的住户以及普查遗漏的住户。个体SAR数据集共标识278个地理区域，涵盖所有1989年中期人口估算中人口规模不低于12万的大型地方政府辖区；较小的地方政府辖区则被合并为人口规模超过12万的统计区域。

个体SAR数据集从1991年人口普查10%样本的剩余住户中抽取，且已移除家庭匿名记录样本集（Household SAR），以此确保两个样本无重叠案例。具体抽样流程如下：剩余住户中的个体按照分层抽样原则被划分为每9人一组，从每组中随机抽取2名个体；集体住宿机构中的个体则被划分为每5人一组，从每组中随机抽取1名个体。随后对所有记录进行了打乱处理，以防止在SAR区域内通过地理信息反推个体身份。个体SAR数据集的抽样过程中存在两处潜在的聚类来源：一是在1%样本抽取阶段个体被聚类至家庭单元中，二是从1%样本中移除家庭SAR数据集后进一步形成的家庭聚类。尽管存在上述情况，个体SAR数据集仍近似于简单随机样本。

更多相关信息（包括使用指南与其他配套文档）可在凯西·马什调查研究中心（Cathie Marsh Centre for Survey Research）的匿名记录样本集（Samples of Anonymised Records）官网获取，网址为http://www.ccsr.ac.uk/sars/。