National Risk and Vulnerability Assessment Survey 2007-2008 - Afghanistan

Abstract
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The National Risk and Vulnerability Assessment 2007/8 is a nationally representative multi-purpose survey. The main objectives of the survey are to provide up-to-date information for assessing the situation of the people of Afghanistan and to furnish data needed for monitoring progress toward development goals.

Geographic coverage
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National

Analysis unit
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- Households
- Individuals
- Communities

Kind of data
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Sample survey data [ssd]

Sampling procedure
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Sampling Design

The sampling design of the NRVA 2007/8 built upon the experiences from the NRVA 2005 and the same sampling approach was maintained, with representative statistics generated for 34 provinces, 11 instead of 10 urban centres, and the nomadic pastoralists. Based on the CSO pre-census household listing data, a geographically ordered list of all of the primary sampling units (PSUs) (rural settlements and urban blocks) was created with their estimated number of households. The resulting sample is a total of 2,441 PSUs and 20,576 households (19,528 from the settled urban and rural population and 131 (1,048 households) from the Kuchi population.

The use of a random start and a pre-determined sampling interval provided each household with an equal chance of being selected. Once individual households had been selected, seven other households were selected within the same PSU. Consequently, in every PSU, eight households were interviewed. To avoid the problem of household replacements in the field, the 2007/8 sample design was improved by randomly selecting four households that were kept as reserve in case the household had moved away.

A major difference with the 2005 assessment is the removal of the seasonality bias by conducting the survey yearround during all 12 months. The main considerations for moving from data collection in summer only to the year-round strategy were:
• to capture the seasonality of consumption and other dimensions of welfare;
• to improve the quality of the collected data;
• to field a smaller group of carefully selected, well trained and properly supervised interviewers;
• to permit higher quality field and data validation procedures, through avoiding a concentration of the sample into just two months;
• to be consistent with international standards for obtaining seasonally biased estimates.

Note: See detailed sampling methodology in Annex II of the final report which is presented in this documentation.

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

Research instrument
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The core of NRVA 2007/8 survey is a household questionnaire consisting of 20 sections, 14 administered by male interviewers and answered by the male head of household, and six asked by female interviewers from female respondents.

摘要
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《2007/8年阿富汗国家风险与脆弱性评估》是一项具有全国代表性的多用途调查。该调查的主要目标是提供最新信息，以评估阿富汗人民的情况，并为监测向发展目标迈进所需的进展提供数据。
地理覆盖范围
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全国
分析单位
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- 家庭
- 个人
- 社区
数据类型
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样本调查数据 [ssd]
抽样程序
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抽样设计

《2007/8年阿富汗国家风险与脆弱性评估》的抽样设计基于2005年NRVA的经验，并维持了相同的抽样方法，为34个省、11个而非10个城镇中心和游牧牧民产生了代表性的统计数据。基于国家统计局的人口普查前家庭清单数据，创建了一个按地理顺序排列的所有一级抽样单位（PSU，包括农村定居点和城市街区）的清单，并列出了其估计的家庭数量。由此产生的样本包括总计2,441个PSU和20,576户家庭（其中19,528户来自定居的城乡人口，131户（1,048户家庭）来自库奇人口）。

随机起始点和预定的抽样间隔的使用确保了每个家庭被选中的机会均等。一旦选定个别家庭，在同一个PSU内还会选择另外七个家庭。因此，在每一个PSU中，共有八个家庭接受了访谈。为了避免现场家庭替换的问题，2007/8的样本设计通过随机选择四个作为储备的家庭得到了改进，以防家庭搬家。

与2005年评估的主要不同之处在于通过全年12个月进行调查，消除了季节性偏差。从仅夏季收集数据转向全年策略的主要考虑因素包括：
• 捕获消费和其他福利维度的季节性；
• 提高收集数据的质量；
• 部署一个由精心挑选、经过良好训练并得到适当监督的访谈者组成的小组；
• 通过避免样本集中在仅两个月内，执行更高质量的现场和数据验证程序；
• 与获取季节性偏差估计的国际标准保持一致。

注意：有关详细的抽样方法，请参阅本文档中最终报告的附件II。

数据收集方式
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面对面 [f2f]
研究工具
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《2007/8年阿富汗国家风险与脆弱性评估》调查的核心是一份家庭问卷，包含20个部分，其中14个由男性访谈员进行管理并由家庭男性户主回答，其余6个由女性访谈员向女性受访者提问。