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National Income Dynamics Study 2012

South Africa, 2012
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Reference ID
ZAF_2012_NIDS-W3_v04_M
Producer(s)
Southern Africa Labour and Development Research Unit
Metadata
DDI/XML JSON
Study website
Created on
Dec 23, 2014
Last modified
Mar 29, 2019
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91942
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Questionnaires
National Income Dynamics Study Wave 3: 2012: Adult (15+) Questionnaire
Download [PDF, 443.97 KB]
Date 2012-01-01
Country South Africa
Language English
Publisher(s) National Income Dynamics Study
Description This is the questionnaire used to collect data on adults in households
Download https://datacatalog.ihsn.org//catalog/5553/download/66634
National Income Dynamics Study Wave 3: 2012: Child (0-14) Questionnaire
Download [PDF, 265.42 KB]
Date 2012-01-01
Country South Africa
Language English
Publisher(s) National Income Dynamics Study
Description This is the questionnaire used to collect data on children in households
Download https://datacatalog.ihsn.org//catalog/5553/download/66635
National Income Dynamics Study Wave 3: 2012: Household Questionnaire
Download [PDF, 649.15 KB]
Date 2012-01-01
Country South Africa
Language English
Publisher(s) National Income Dynamics Study
Description This is the questionnaire used to collect data on households in NIDS Wave 3 2012. Note that the initial version of this questionnaire uploaded with the Public Use Files was incorrect, and has been replaced with this version 1.1 which matches the questionnaire used in the field.
Download https://datacatalog.ihsn.org//catalog/5553/download/66636
National Income Dynamics Study Wave 3: 2012: Proxy Questionnaire
Download [PDF, 168.19 KB]
Date 2012-01-01
Country South Africa
Language English
Contributor(s) The proxy adult questionnaire was administered to a knowledgeable adult (18+) household member when a household member could not be interviewed.
Publisher(s) National Income Dynamics Study
Description This is the questionnaire used for proxy interviews. Proxy interviews were completed for adult (18+) resident household members who could not be found for an interview during the survey.
Download https://datacatalog.ihsn.org//catalog/5553/download/66637
Technical documents
National Income Dynamics Study Wave 3 User Manual
Download [PDF, 978.84 KB]
Author(s) Edited by Louise de Villiers, Michael Brown, Ingrid Woolard, Reza Daniels and Murray Leibbrandt
Date 2014-02-01
Country South Africa
Language English
Publisher(s) National Income Dynamics Study
Description This is the user guide for the survey
Table of contents List of Contributors ................................................................................................................................. v
Foreword ................................................................................................................................................ vi
1. Using This Manual ........................................................................................................................... 1
1.1 What All Users Have To Know ................................................................................................. 1
1.2 Citation Of NIDS Data And Documentation ............................................................................ 1

2. The NIDS Data ................................................................................................................................. 2
2.1 Process To Download The Data .............................................................................................. 2
2.2 Data Formats ........................................................................................................................... 3
2.3 Data Structure ......................................................................................................................... 3
2.4 File Structure ........................................................................................................................... 4
2.5 Identifiers ................................................................................................................................ 5
2.6 Merging Datasets Within & Between Waves .......................................................................... 5
2.6.1 Merging within Wave 3 ................................................................................................... 6
2.6.2 Merging between waves ................................................................................................. 6
2.7 Variable Naming Convention .................................................................................................. 7
2.7.1 Wave ............................................................................................................................... 7
2.7.2 Source ............................................................................................................................. 7
2.7.3 Section leaders ................................................................................................................ 7
2.7.4 Subsections ..................................................................................................................... 8
2.7.5 Descriptors ...................................................................................................................... 8
2.7.6 Sub-questions .................................................................................................................. 8
2.8 Non-Response Codes .............................................................................................................. 8
2.9 Anonymisation ........................................................................................................................ 9
2.10 Secure Data ............................................................................................................................. 9
2.11 Program Library ...................................................................................................................... 9

3. Data Collection .............................................................................................................................. 10
3.1 Data Collection Process ......................................................................................................... 10
3.1.1 Overview of CAPI cycle .................................................................................................. 11
3.1.2 Overview of the tracking process ................................................................................. 12
3.1.3 Contacting respondents ................................................................................................ 14
3.2 Data Quality Issues And Data Collection ............................................................................... 14
3.2.1 Unit non-response ........................................................................................................ 14
3.2.2 Item non-response ........................................................................................................ 16
3.2.3 Data consistency ........................................................................................................... 16
3.2.4 The mechanics of data quality checks .......................................................................... 17
3.3 Fieldwork Schedule ............................................................................................................... 19
3.3.1 Pre-test .......................................................................................................................... 19
3.3.2 Main data collection ..................................................................................................... 19
3.4 Response Rates & Attrition ................................................................................................... 19

4. Derived Variables .......................................................................................................................... 23
4.1 Best Variables ........................................................................................................................ 23
4.2 Geography ............................................................................................................................. 23
4.3 Occupation ............................................................................................................................ 23
4.4 Industry ................................................................................................................................. 24
4.5 Employment Status ............................................................................................................... 24
4.6 Income .................................................................................................................................. 24
4.6.1 Bracket responses ......................................................................................................... 26
4.6.2 Item non-response and imputation .............................................................................. 27
4.6.3 Income from subsistence agriculture ........................................................................... 28
4.6.4 Bonus payments ............................................................................................................ 28
4.7 Expenditure ........................................................................................................................... 29
4.7.1 Imputations ................................................................................................................... 29
4.8 Anthropometric Z-Scores ...................................................................................................... 30
4.8.1 Important note about using the publically released NIDS data to create your own z-scores 31
4.9 Weights ................................................................................................................................. 32
4.9.1 What is new? ................................................................................................................. 32
4.9.2 The relationship between the different weights .......................................................... 32
4.9.3 Design weights .............................................................................................................. 34
4.9.4 The calibrated weights .................................................................................................. 34
4.9.5 Panel weights ................................................................................................................ 36
4.9.6 A final comment on the weights ................................................................................... 39

5. Program Library ............................................................................................................................ 40
5.1 Data Manipulation ................................................................................................................ 40
5.1.1 Merging datasets .......................................................................................................... 40
5.1.2 Reshaping data .............................................................................................................. 40
5.2 Derived Variables .................................................................................................................. 40
5.2.1 Income .......................................................................................................................... 40
5.2.2 Expenditure ................................................................................................................... 41
5.2.3 Deflator ......................................................................................................................... 41
5.2.4 Employment status ....................................................................................................... 42

6. References .................................................................................................................................... 43
Download https://datacatalog.ihsn.org//catalog/5553/download/66638
Changes in W3 Data from V1.1 to V1.2
Download [PDF, 110.82 KB]
Date 2014-02-01
Country South Africa
Language English
Description This documents changes from version 1.1 to version 1.2 of the dataset
Download https://datacatalog.ihsn.org//catalog/5553/download/66639
Other Materials
Program Library.zip
Download [ZIP, 157.66 KB]
Date 2014-01-01
Country South Africa
Publisher(s) SALDRU
Description These are the syntax files for the dataset
Download https://datacatalog.ihsn.org//catalog/5553/download/66640
Zip preview
Program 1 - Merging Adult, Child & Proxy to the Household Roster.txt
Program 2 - Merging the Household questionnaire to the individual datasets.txt
Program 3a - Merging individual across Wave 1 and Wave 2.txt
Program 3b - Merging individual across Wave 2 and Wave 3.txt
Program 3c - Merging individual across Wave 1, Wave 2 and Wave 3.txt
Program 4 - Merging Household questionnaires across Wave 1 and Wave 2.txt
Program 5a - W1 Reshaping the Birth History section and merging in the child questionnaires.txt
Program 5b - Reshaping the Birth History section and merging in the child questionnaires.txt
Program 6a - Reshaping of the mortality section to create a roster.txt
Program 6b - W2 Reshaping of the mortality section to create a roster.txt
W1_Employment Status Do-Files 20140228.zip
W1_Expenditure Do-Files 20140228.zip
W1_Income Do-Files 20140228.zip
W2_Employment Status Do-Files 20140228.zip
W2_Expenditure Do-Files 20140228.zip
W2_Income Do-Files 20140228.zip
W2_Wealth Do-Files 20140228.zip
W3_Employment Status Do-Files 20140228.zip
W3_Expenditure Do-Files 20140228.zip
W3_Income Do-Files 20140228.zip
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