National Household Travel Survey 2013 - South Africa

Abstract
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The National Household Travel Survey (NHTS) 2013 is the second round of the NHTS series designed to assess domestic transport and tourism travel patterns in the country, as well as attitudes about transport.

Geographic coverage
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The survey has national coverage.

Analysis unit
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Households and individuals

Universe
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The target population of the survey consists of all private households in all nine provinces of South Africa and residents in workers' hostels. The survey does not cover other collective living quarters such as students' hostels, old-age homes, hospitals, prisons and military barracks.

Kind of data
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Sample survey data

Sampling procedure
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The sample design for the NHTS 2013 was based on a master sample (MS) that used a two-stage, stratified design with probability-proportional-to-size (PPS) sampling of PSUs from within strata, and systematic sampling of dwelling units (DUs) from the sampled primary sampling units (PSUs). A self-weighting design at provincial level was used and MS stratification was divided into two levels, primary and secondary stratification. Primary stratification was defined by metropolitan and non-metropolitan geographic area type. During secondary stratification, the Census 2001 data were summarised at PSU level. The following variables were used for secondary stratification; household size, education, occupancy status, gender, industry and income.

Census enumeration areas (EAs) as delineated for Census 2001 formed the basis of the PSUs. The following additional rules were used:
• Where possible, PSU sizes were kept between 100 and 500 dwelling units (DUs);
• EAs with fewer than 25 DUs were excluded;
• EAs with between 26 and 99 DUs were pooled to form larger PSUs and the criteria used was same settlement type;
• Virtual splits were applied to large PSUs: 500 to 999 split into two; 1 000 to 1 499 split into three; and 1 500 plus split into four PSUs; and
• Informal PSUs were segmented.

A Randomised Probability Proportional to Size (RPPS) systematic sample of PSUs was drawn in each stratum, with the measure of size being the number of households in the PSU. Altogether approximately 3 080 PSUs were selected. In each selected PSU a systematic sample of dwelling units was drawn. The number of DUs selected per PSU varies from PSU to PSU and depends on the Inverse Sampling Ratios (ISR) of each PSU.

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

Data appraisal
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The original report (called a Release) provided by Statistics SA had incorrect information on response rates. This document has been replaced by a version amended by Statistics SA to reflect the correct response rates for the survey.

摘要
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《2013年全国家庭出行调查》（NHTS 2013）是该调查系列的第二轮，旨在评估我国国内交通运输和旅游出行模式，以及对交通运输的态度。
地理覆盖范围
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本调查覆盖全国范围。
分析单位
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家庭和个人
总体
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本调查的目标群体包括南非所有九个省份的私营家庭以及工人宿舍的居民。调查不涵盖其他集体居住场所，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
抽样程序
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NHTS 2013的样本设计基于一个主样本（MS），采用两阶段分层设计，对层内的PSU进行概率成比例抽样（PPS），并对样本初级抽样单位（PSU）内的居住单位（DU）进行系统抽样。省级层面采用自加权设计，MS分层分为两级：初级分层和次级分层。初级分层由城市和非城市地理区域类型定义。在次级分层过程中，将2001年人口普查数据汇总至PSU层面。以下变量用于次级分层：家庭规模、教育程度、居住状态、性别、行业和收入。
人口普查区（EA）是依据2001年人口普查划定的，形成PSU的基础。以下规则被采用：
• 在可能的情况下，PSU的规模保持在100至500个居住单位（DU）；
• 低于25个DU的EA被排除在外；
• 26至99个DU的EA被合并形成更大的PSU，合并标准为同一居住类型；
• 对大型PSU实施虚拟分割：500至999个分割为两个；1000至1499个分割为三个；1500个以上分割为四个PSU；
• 非正式PSU被分割。
在每个层中抽取随机概率成比例（RPPS）的系统样本PSU，规模衡量标准为PSU中的家庭数量。总共约选取了3080个PSU。在每个选定的PSU中，抽取居住单位的系统样本。每个PSU中选取的DU数量因PSU而异，取决于每个PSU的逆抽样比（ISR）。
数据收集方式
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面对面（f2f）
数据评估
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由南非统计局提供的原始报告（称为发布版）在应答率方面存在错误信息。此文件已被统计局修订版替代，以反映调查的正确应答率。