Sampling procedure
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THE CLEANED AND HARMONIZED VERSION OF THE SURVEY DATA PRODUCED AND PUBLISHED BY THE ECONOMIC RESEARCH FORUM REPRESENTS 100% OF THE ORIGINAL SURVEY DATA COLLECTED BY THE CENTRAL AGENCY FOR PUBLIC MOBILIZATION AND STATISTICS (CAPMAS)
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---> Sample Design and Selection
The sample of Labor Force Survey is a two-stage stratified cluster sample and selfweighted to the extent practical.
The main elements of the sampling design are described as follows:
* Sample Size
The sample size was 90,000 households, distributed at a ratio of 44% to urban areas and 56% to rural areas. They were distributed by means of an average of the proportional to size (P.P.S) method and the Square root allocation method in order to raise the minimum for small governorates.
The sample was divided to be 551 in urban areas and 699 in rural areas.
* Cluster size
The cluster size is 18 households.
* Sampling stages:
A- First sampling stage:
(1) Primary Sampling Unit:The 2017 population census data was used to obtain an electronic list of areas of aid, or in other words, enumeration areas (EAS) with an average of 600-750 households through all the republic. This list represents the framework of the first phase of the sample, where 10,000 auxiliary areas were selected as primary sampling units (PSU) for the first phase of the main sample.
(2) Stratification and allocation of the initial inspection unit The governorate is considered the primary layer, which is divided into urban and rural as sub-classes, where the allocation commensurate with the size of the sample between governorates, and between urban and rural areas in each governorate in the first phase of inspection, in order to achieve selfweighting of the basic and sub classes at the national level .
B- SECOND Sampling phase:
(1) The division of each initial survey into a number of parts approximately equal in size (150 households / part), each part is called an area plot.
(2) Selecting an area plot (one part of each primary sampling unit) using the simple random sampling method.
C) THIRD stage of Sampling (Selection ofcadastral plots):
1- A sample of cadastral plots was chosen for the Labor force survey in a systematic, random sample from the records of cadastral plots in the master sample, 1,250 cadastral plots were allocated to the research sample, which are divided into 551 in urban areas and 699 in rural areas. Where the urban/rural governorate is considered the strata of the republic, the sample is distributed proportionately to the size.
2- The representation of urban and rural areas at the level of the governorates of the Republic has been taken into account.
D- Sample Allocation among Governorates:
Governorate is considered the primary main strata that divided into substrata (Urban/ Rural), allocation proportional to size was determined among governorates as well as among urban and rural in each governorate at the first sampling stage.
Sample frame first Stage:
The basic sample was implemented in September 2022, and it is a three-stage, selfweighted, stratified cluster sample that was drawn from the 2017 Census data to obtain an electronic list of adjunct areas, or in other words enumeration areas (EAs), with an average of 600-750 households, (the size of the areas reached 31,603 regions across the Republic), this list represents the framework of the first stage of the sample.
- The basic sample areas (10,000 cadastral plots) were divided into four groups, each group containing (2,500 cadastral plots), using a simple random sampling method. One of the most important features of random division is that each cadastral plot has the same chance of appearing among the four groups.
- Where 1,300 sub-districts were selected asvprimary sampling units (PSU) for the thirdvstage of the main sample.
Two stages were previously implemented: the first stage was in the basic sample for the year 2018 and the second stage was in the basic sample 2020. The governorate is considered the primary basic class that is divided into urban and rural as sub-stratas, where the allocation was proportional to the size of the sample between the governorates, and between urban and rural in each governorate in the first stage. To inspect in order to achieve self-weighting ofvthe basic and sub-classes at the national level.
- Each primary sampling unit was divided into a number of parts approximately equal in size (150 households/part), each part called a cadastral plot.
- Choosing a cadastral plot (one part of each primary sampling unit) using a random sampling method, and household data is updated for each cadastral plot through a quick count, enumeration of households, and preparing a list of households.
Division of Primary Sampling Unit:
The labor force survey sample was drawn to (1250) enumeration areas and was divided into four rounds. Sample households were drawn from each enumeration area with equal probability using a systematic drawing method.
-The cadastral plots selected for the draw were divided into three months during one quarter and into two sixths for each month.
-The total number of households is 72 households at the level of each selected cadastral plot.
A more detailed description of the different sampling stages and allocation of sample across governorates is provided in the Methodology document available among external resources in Arabic.