National Income Dynamics Study 2014 - South Africa

Abstract
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The National Income Dynamics Study (NIDS) is a face-to-face longitudinal survey of individuals living in South Africa as well as their households. The survey was designed to give effect to the dimensions of the well-being of South Africans, to be tracked over time. At the broadest level, these were:

· Wealth creation in terms of income and expenditure dynamics and asset endowments
· Demographic dynamics as these relate to household composition and migration
· Social heritage, including education and employment dynamics, the impact of life events (including positive and negative shocks), social capital and intergenerational developments
· Access to cash transfers and social services

Geographic coverage
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National

Analysis unit
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Households

Universe
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The target population for NIDS was private households in all nine provinces of South Africa, and residents in workers' hostels, convents and monasteries. The frame excludes other collective living quarters, such as student hostels, old age homes, hospitals, prisons and military barracks.

Kind of data
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Sample survey data [ssd]

Sampling procedure
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A stratified, two-stage cluster sample design was employed in sampling the Dwelling units to be included in the base wave. In the first stage, a sample of 400 Primary Sampling Units (psus)2 was drawn (by statisticians at Stats SA) from Stats SA's 2003 Master Sample of 3000 psus. At the time that the 2003 Master Sample was compiled, eight non-overlapping samples of ten or twelve dwelling Units were systematically drawn within each PSU. Each of these samples is termed A “cluster” by Stats SA. These clusters were then allocated to the various household Surveys that were conducted by Stats SA between 2004 and 2007 (such as the Labour Force Surveys, General Household Surveys and the 2005/06 Income and Expenditure Survey). However, two clusters in each PSU were never used by Stats SA and these were allocated to NIDS.

In the first stage, a sample of 400 PSUs had to be drawn from the 3000 PSUs in the Master Sample. The explicit strata in the Master Sample are the 53 district councils (DCs). The sample was proportionally allocated to these 53 strata and PSUs were selected within strata with probability proportional to size. It should be noted that the sample was not designed to be representative at provincial level, implying that analysis of the results at the province level is not recommended.

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

摘要
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国家收入动态研究（NIDS）是对居住在南非的个人及其家庭进行面对面纵向调查的研究。该调查旨在体现南非人民福祉的各个维度，并随时间追踪其变化。在最为宏观的层面，这些维度包括：

· 通过收入和支出动态以及资产配置来衡量财富创造
· 与家庭构成和人口迁移相关的 demographics 动态
· 社会遗产，包括教育和就业动态、生活事件的影响（包括正面和负面的冲击）、社会资本以及代际发展
· 货币转移和社会服务的获取

地理覆盖范围
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全国

分析单元
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家庭

总体
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NIDS 的目标总体为南非九个省份的私人家庭，以及工人宿舍、修道院和寺院中的居民。抽样框架排除了其他集体居住地，例如学生宿舍、养老院、医院、监狱和军事营房。

数据类型
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样本调查数据 [ssd]

抽样程序
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在抽样纳入基线波次的住宅单位时，采用了分层、两阶段集群抽样设计。在第一阶段，从 Stats SA 的 2003 年 3000 个主样本单位（PSU）中抽取了 400 个一级抽样单位（PSU）（由 Stats SA 的统计学家进行）。在 2003 年主样本编制时，每个 PSU 内系统地抽取了十个或十二个住宅单位，这些抽样单位被 Stats SA 称为“集群”。然后，这些集群被分配给 Stats SA 在 2004 年至 2007 年间进行的各种家庭调查（如劳动力调查、一般家庭调查和 2005/06 年收入和支出调查）。然而，每个 PSU 中的两个集群从未被 Stats SA 使用，这些集群被分配给了 NIDS。

在第一阶段，需要从 3000 个 PSU 中抽取 400 个 PSU。主样本中的显式层是 53 个区议会（DC）。样本按比例分配到这 53 个层，并在层内以规模比例的概率选择 PSU。应注意的是，样本并非旨在省级层面具有代表性，这意味着在省级层面分析结果不推荐。

数据收集方式
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面对面 [f2f]