Transcript PPT

CASE STUDIES OF
SOME SURVEYS IN
SADC COUNTRIES
Experience from Tanzania
Household Surveys and Measurement of Labour
Force with Focus on Informal Economy held in
Maseru, Lesotho from 14-18 April 2008.
Outline
The Presentation will cover the following areas:
 Source of Labour Market Information
 Frequency of Data Collection
 Methodological approach for Labour Force
surveys
 Listing of Households
 Sample Size
 Software used for Estimation
 Quality Control
 Levels of Reporting the Findings
The Sources of Labour Market
Information (LMI)
 Household Based Surveys:
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Labour Force Surveys (major and reliable source).
Informal Sector Surveys (a module in Labour Force Surveys).
Household Budget Surveys HBS (limited source)
Demographic Health Surveys e.g. TDHS (limited source)
 Establishment Surveys:
– Annual Employment & Earning Survey (reliable LMI)
– Annual Survey of Industrial Production (limited LMI)
– Central Register of Establishments (limited LMI)
 Population and Housing Census (limited LMI):
The Frequency of Data Collection
 Household Based Surveys:
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Labour Force Surveys e.g. ILFS – after every 5 years.
Informal Sector Surveys – a module under ILFS.
Household Budget Surveys e.g. HBS – after every 5 years
Demographic Health Surveys e.g. TDHS – after every 5 years
 Establishment Surveys:
– Annual Employment & Earnings Survey – annual
– Annual Survey of Industrial Production - annual
– Central Register of Establishments – semi annual
 Population and Housing Census – every after 10
years:
Methodological approach for
Labour Force surveys:
 The Integrated Labour Force Survey (ILFS)
constitutes four modules, namely:
 General labour force
 Child labour
 Informal sector and
 Time Use
Methodological approach for
Labour Force surveys Cont…
The Structure of a Questionnaire:
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LFS 1: Head of Household Questionnaire
LFS 2: Individual Questionnaire
CLS 1: Child Labour Questionnaire No. 1
CLS 2: Child Labour questionnaire no. 2
TUS: Time use Questionnaire/Diary
Methodological approach for
Labour Force surveys Cont…
Sample Design and Estimation:
 The Labour Force Surveys in Tanzania use the
existing National Master Sample (NMS)
 The NMS has a capacity to provide various estimates
depending on the coverage size of the planned
survey. The Labour Force Surveys we conduct in
Tanzania provide national estimates
 For national estimates the NMS consists of 140
villages and 244 urban enumeration areas (EAs)
distributed throughout the country
Methodological approach for
Labour Force surveys Cont…
 Sample Frame:
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The sampling frame for the current NMS is based on
the results of the 2002 Population and Housing
Census.
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The NMS structure built by using the administrative
boundaries which fall under the levels of region,
district, ward and village or street.
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Each primary sampling unit (PSU) in the NMS
identified its location through the above mentioned
administrative localities (i.e. region, district etc.)
Methodological approach for
Labour Force surveys Cont…
 The village is a primary sampling unit (PSU)
representing the rural areas and the EA is the PSU
presenting the urban areas
 The PSUs have been established through a
probability proportional to size without replacement
(ppswor)
 The systematic sampling procedure was used for the
selection of PSU
Methodological approach for
Labour Force surveys Cont…
 Listing of Households:
 The household listing exercise is normally conducted on each
sample cluster within two months before the commencement
of the field work.
 The duration between listing of households and the moment to
start data collection shouldn't be longer to avoid problems of
migration among the listed households (especially in urban
clusters)
 All households within each cluster are listed to establish
sampling frame for households
selection in each cluster.
Systematic sampling procedure used to selection households
to be interviewed during the data collection
Methodological approach for
Labour Force surveys Cont…
 Rural Sample Size:
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From each selected village a total of 80 households
sampled to be interviewed within the survey period
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The 80 sampled households then distributed into
4 quarters whereby 20 households are allocated
to be interviewed in each quarter
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Allocation of households for interview within four
quarters in the year has been aimed to capture
seasonal variations in rural areas
Methodological approach for Labour
Force surveys Cont…

Urban Sample Size:
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From each selected EA in urban areas, 30
households are selected to be interviewed
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Taking into consideration that, the urban activities
have no seasonality element, the enumeration
system is dealt with differently from that of the
rural areas.
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The EAs in urban areas are distributed in four
equally groups in such a way that each group has
to be enumerated in a specified quarter.
Software used for estimation:
 Currently there are two Software used in
both Data Capturing and Tabulation:
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Census and Survey Processing (CSPro)
programme is used in data capturing
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SPSS is used for tabulation
Quality Control:
 In order to ensure reliability and credibility of
data collection the following quality control
measures designed:
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During listing exercise enumerators work
hand in hand with Local Authorities to make
sure that all households are listed
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In urban areas the EAs boundaries are clearly
located to avoid overlapping with
neighbouring EAs
Quality Control Cont…
 Some times where necessary, supervision maps of
EAs were used by supervisors to identify the EAs
that enumerators fail to locate them
 Enumerators were provided with all required
materials for both during listing and data collection
operations
 Close supervision maintained in both during listing
and data collection operations. Head quarters
Supervisors monitor field work on quarterly basis
and the regional supervisors had to monitor
enumerators in the field four times in a quarter.
Levels of Reporting the
Findings:
The final results disseminated into
three geographical levels, namely:
 Rural Area
 Dar es Salaam City and
 Other Urban Areas
Thank you