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Optimum sampling strategy for National Households In Abu Dhabi (The Household Master Sample 2012). Authors : Mohammed Al Rifai (Ph.D.) Mariam Al Qemzi. 21/August/2014. Contents. Introduction Problem Identification - PowerPoint PPT Presentation
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Optimum sampling strategy for
National Households In Abu Dhabi
(The Household Master Sample 2012)
Authors :Mohammed Al Rifai (Ph.D.) Mariam Al Qemzi
21/August/2014
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Contents
Introduction
Problem Identification
The Structure Of Abu Dhabi Sampling Frame
Stratification Of The Master Sampling Frame
Household Nationality Strata
Master Sample Size And Allocation
Proposed Allocation Criteria By Nationality Strata
Conclusion
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The Emirate of Abu Dhabi
•Almost 43 years since the formation of the UAE.
•UAE comprises Abu Dhabi plus six other Emirates.
•Abu Dhabi accounts for over 80 per cent of UAE land mass.
•Abu Dhabi contains around one third of UAE population.
•Emirati citizens make up around 20 per cent of Abu Dhabi population.
•Abu Dhabi oil represents around 10 per cent of global reserves.
Statistics Centre – Abu Dhabi
•SCAD is the official source of statistical data for Abu Dhabi. •Our Mission:
1 .Develop and organize a statistical system in the Emirate.
2 .Provide relevant and reliable official statistics serving policy makers, the business community and the public.
3 .Celebrated five years of operation in April 2014.
4 .Operates in accordance with international best practice to provide range of statistics.
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Introduction
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The problem: “ How to improve the sample strategy for national households to ensure accuracy? ”
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National 22%
Non National 60%
Shared18%
Households Type
Problem Identification
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The Structure Of Abu Dhabi Sampling Frame
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Abu Dhabi Emirate
Regions (3)
Districts (117)
Sectors (1000)
EA (1883)
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The Structure Of Abu Dhabi Sampling Frame
Region Total No. EAs% All
Households% National
Households
% Non National
Households
% Shared Households
Abu Dhabi 1,215 64.4 58 70.2 52.8
Al Ain 551 29.2 37 23.6 38.4
Al Gharbia 117 6.4 5 6.2 8.7
Total 1,883 100 100 100 100
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Stratification Of The Master Sample Frame
• Homogeneity of EA within Strata.
• Key Domains of Analysis:– Region– Citizenship
• Levels of stratification of EAs:
7
Level 1
•Geographic domains which
are the three regions of Abu
Dhabi Emirate
Level 2
•Concentration of National
households within each
region
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Households Nationality Strata
The nationality strata are as follows:
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Stratum Concentration of
National Households Total No. of EAs
%National Households for the
stratum
%All Households
1 0 to 24.9% 1,315 7.3 69.9
2 25 to 49.9% 255 35.8 13.1
3 50 to 74.9% 199 61.7 11.1
4 75% or more 114 83.7 5.9
Total 1,883 21.5 100
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Master Sample Size And Allocation
Master Sample size:
Number of PSUs in the master sample should be sufficiently large to provide sample households for:
• Household surveys that are currently planned.
• Future Surveys – may require larger samples
• 4 Replicates.
Result - A sample of 560 EAs. This represents nearly 30% of all EAs used in Census 2011.
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Master Sample Size And Allocation
Master sample allocation:
Allocation by region based on:– previous sampling errors for key statistics.– 4 Replicates
EA allocation:
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EA count Region
320 Abu Dhabi
160 Al Ain
80 Al Gharbia
560 Total
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The Proposed Allocation Criteria By Nationality Strata
• The modified proportional allocation criteria can be expressed as follows:
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4
1h
hh
hh
h
NN
W
NN
Wnn
Where:
nh = number of sample EAs allocated to stratum h.
n = total number of sample EAsWh = weight assigned to nationality stratum h
Nh = total number of households in nationality stratum h
N = total number of households in frame
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The Proposed Allocation Criteria By Nationality Strata
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4 3 2 1 Stratum
75 – 100% 50 - 74.9% 25 - 49.9% 0 – 24.5% Concentration of National Households
5.9% 11.1% 13.1% 69.9% %of All households
83.7% 61.7% 35.8% 7.3% %National households
4 3 2 1 Allocated weights
The expected ratio of the national household ( p ) in the sample Percentage of national households in the stratum (h): weight assigned to nationality stratum h : the ratio of sample size for stratum (h) to population size. ()
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Conclusion
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• % National Households using proportional Allocation: 21.5%
• % National Households using Modified Allocation: 35.6%
• Implementation: high level of precision in LFS2012
Sample EAs by Region and Nationality Strata
RegionNationality Stratum Estimated %
National Households in SampleTotal 1 2 3 4
Abu Dhabi 320 155 58 67 40 33.3%
Al Ain 160 65 23 39 33 40.6%
Al Gharbia 80 39 22 10 9 29.9%
Total 560 259 103 116 82 35.6%
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• For more information please read the paper.• Website: www.scad.ae• Authors:
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Contact
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