National Income Dynamics Study - Coronavirus Rapid Mobile Survey 2020, Wave 2 - South Africa

Abstract
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The National Income Dynamics Study - Coronavirus Rapid Mobile Survey 2020 investigates the socioeconomic impacts of the national lockdown associated with the State of Disaster declared in South Africa in March 2020, and the social and economic consequences in South Africa of the global Coronavirus pandemic. NIDS-CRAM forms part of a broader study called the Coronavirus Rapid Mobile Survey (CRAM) which aims to inform policy using rapid reliable research on income, employment and welfare in South Africa, in the context of the global Coronavirus pandemic. The study is run by researchers from the University of Stellenbosch, University of Cape Town (UCT) and University of the Witwatersrand (Wits). The NIDS-CRAM survey data collection and production operations were implemented by the Southern Africa Labour and Development Research Unit (SALDRU) at UCT. The data is collected with Computer Assisted Telephone Interviewing (CATI), with data collection repeated over several months.

Geographic coverage
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The survey had national coverage. As NIDS was only designed to be nationally representative, it is inadvisable to use the NIDS-CRAM data to calculate provincial or regional totals.

Analysis unit
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Households and individuals

Universe
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The universe of the study is South Africans 18 years old or older.

Kind of data
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Sample survey data

Sampling procedure
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The sample frame for NIDS-CRAM is the NIDS Wave 5 CSMs and TSMs who were 18 years or older at the time of the NIDS-CRAM Wave 1 fieldwork preparation in April 2020. The sample was drawn using a stratified sampling design. No attempt was made to check whether successfully re-interviewed individuals resided in the same households as they did in Wave 5. In the survey, individuals from larger households were more likely to be sampled than individuals from smaller households.

Mode of data collection
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Computer Assisted Telephone Interview [cati]

Research instrument
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Though NIDS-CRAM is a follow-up with NIDS Wave 5 respondents, the NIDS-CRAM survey uses a much shorter questionnaire, with a focus on the Coronavirus pandemic and the national lockdown. The questionnaire was changed slightly across waves and data users should check the questionnaires for each wave when using the data.

摘要
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国家收入动态研究——冠状病毒快速移动调查2020年（National Income Dynamics Study - Coronavirus Rapid Mobile Survey 2020）旨在探究南非于2020年3月宣布的国家灾难状态下的全国封锁对社会经济的影响，以及全球冠状病毒大流行对南非社会经济产生的后果。NIDS-CRAM是该研究的一部分，称为冠状病毒快速移动调查（Coronavirus Rapid Mobile Survey，简称CRAM），该调查旨在利用快速可靠的研究成果，对南非在冠状病毒大流行背景下的收入、就业和福利状况进行政策指导。研究由南非 Stellenbosch 大学、开普敦大学（University of Cape Town，简称UCT）和维特沃特斯兰德大学（University of the Witwatersrand，简称Wits）的研究人员共同执行。NIDS-CRAM的调查数据收集和生产操作由开普敦大学的南非劳动与开发研究单位（Southern Africa Labour and Development Research Unit，简称SALDRU）实施。数据通过计算机辅助电话访谈（Computer Assisted Telephone Interview，简称CATI）的方式收集，并在数月内重复收集。

地理覆盖范围
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该调查覆盖全国范围。由于NIDS仅设计为全国代表性，因此不建议使用NIDS-CRAM数据来计算省级或地区总计数。

分析单元
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家庭和个人

总体范围
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研究的总体范围为18岁及以上的南非居民。

数据类型
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样本调查数据

抽样程序
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NIDS-CRAM的抽样框架为NIDS第5波CSMs和TSMs，他们在2020年4月NIDS-CRAM第1波现场工作准备时已满18岁。样本采用分层抽样设计抽取。未尝试检查成功重新访谈的个人是否居住在与其他第5波相同的家庭中。在调查中，来自大家庭的个人比来自小家庭的人更有可能被抽样。

数据收集方式
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计算机辅助电话访谈[cati]

研究工具
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尽管NIDS-CRAM是对NIDS第5波受访者的后续调查，但NIDS-CRAM调查使用的是一份更简短的问卷，重点在于冠状病毒大流行和全国封锁。问卷在各个波次之间略有变化，数据使用者在使用数据时应检查每个波次的问卷。