determining sampling methods cei 2015.0 implementing the reproductive health assessment toolkit for...
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Determining Sampling MethodsDetermining Sampling Methods
CEI 2015.0 Implementing the Reproductive Health Assessment Toolkit for Conflict-Affected Women
November 5, 2006
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ObjectivesObjectives
At end of session, you will be able to:
• Understand importance of sampling
• Describe advantages/disadvantages of random and cluster sampling
• Obtain hands on sampling experience
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What is Sampling?What is Sampling?
The procedure by which some members of a population are selected as representative of the entire population
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Importance of SamplingImportance of Sampling
• Good sampling = representative data!!– Make reasonable inferences
• Decreases costs
• Speeds up data collection
• Balance feasibility
and precision
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Toolkit SamplingToolkit Sampling
• Sampling unit = households (HH)• One woman of reproductive age (WRA)
per HH
• Choose random or cluster sampling
• Modify based on needs
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AreaArea
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AreaArea
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Geographic BoundsGeographic Bounds
• Well-defined– Refugee or IDP camp– Groups of camps – Villages or towns where displaced people
live
• Use a map
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Random SamplingRandom Sampling
Advantage Disadvantage
Random • More precise• Smaller sample
size
• Complete HH listing• Could use more
resources • More travel/time
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Cluster SamplingCluster Sampling
Advantage Disadvantage
Cluster • No/incomplete
HH listing• Could use less
resources • Less travel
• Less precise• Larger sample size
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Random vs ClusterRandom vs Cluster
Advantage Disadvantage
Random • More precise• Smaller sample
size
• Complete HH listing• Could use more
resources • More travel/time
Cluster • No/incomplete
HH listing• Could use less
resources • Less travel
• Less precise• Larger sample size
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Random SamplingRandom Sampling
• Assumptions:– Prevalence rate of 50%– 95% confidence intervals +/- 5%– Response rate of 80%
• 400 completed interviews must sample 500 HH
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Random Sampling StepsRandom Sampling Steps
• Step 1. Obtain HH lists
• Step 2. Identify HHs and select sample HHs to be surveyed
• Step 3. Select one WRA with each selected HH to be surveyed
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Sample Household ListSample Household List
ID# Name Age Family size
# WRA Date of arrival
2416 X 31 6 2 11/27/2001
2723 X 26 4 1 8/22/1999
2714 X 43 4 1 4/21/2001
2448 X 53 5 0 7/1/2000
2578 X 28 4 2 11/20/2000
2463 X 34 5 1 7/5/1998
Household removed before
selection because no WRA
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Practice Exercise: RandomPractice Exercise: Random
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Random: Table 1Random: Table 1
Camp Households Household proportion
Sample size
Camp 1 367
Camp 2 405
Camp 3 245
Camp 4 271
Camp 5 350
Total 1638
367/1638 =22.4%
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Random: Table 1Random: Table 1
Camp Households Household proportion
Sample size
Camp 1 367 367/1638 = 22.4%
Camp 2 405 405/1638 = 24.7%
Camp 3 245 245/1638 = 15.0%
Camp 4 271 271/1638 = 16.5%
Camp 5 350 350/1638 = 21.4%
Total 1638 100.0%
.224 x 500= 112
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Random: Table 1Random: Table 1
Camp Households Household proportion
Sample size
Camp 1 367 367/1638 = 22.4% .224 x 500= 112
Camp 2 405 405/1638 = 24.7% .247 x 500= 124
Camp 3 245 245/1638 = 15.0% .150 x 500= 75
Camp 4 271 271/1638 = 16.5% .165 x 500= 83
Camp 5 350 350/1638 = 21.4% .214 x 500= 107
Total 1638 100.0% 501
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Random Numbers TableRandom Numbers Table
• OR use computer applications
• For both random and cluster
• Example: Randomly select 112 HHs from 367 HHs for Camp 1.– How many digits -> 001-367, need 3 digits– Choose a direction -> decide to go right– Choose starting point – Read the number of digits– Repeat until 112 HHs selcted
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Random Numbers TableRandom Numbers Table
A B C D E
1 8450 6992 6563 0340 2649
2 5952 1443 7100 8444 3904
3 5711 6779 9388 9668 4167
4 2681 8047 0494 7853 8411
5 0739 3114 3997 3482 3226
6 8985 2463 5054 3448 6357
437 (discard not in range)
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Random Numbers TableRandom Numbers Table
A B C D E
1 8450 6992 6563 0340 2649
2 5952 1443 7100 8444 3904
3 5711 6779 9388 9668 4167
4 2681 8047 0494 7853 8411
5 0739 3114 3997 3482 3226
6 8985 2463 5054 3448 6357
100 HH is selected
for sample
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Cluster SamplingCluster Sampling
• Can not guarantee precision
• Assumptions:– Response rate of 80%– At least 25 clusters with 25 HH in each
• Probability proportional to size (PPS)
• 500 completed surveys so sample 625 HHs
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Cluster SamplingCluster Sampling• Step 1. Define clusters within geographic
boundaries• Step 2. Determine the number of HHs
within each cluster• Step 3. Select the clusters to be surveyed • Step 4. Select the HHs within each cluster
to be surveyed • Step 5. Select one WRA within each
selected HH to be surveyed
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Practice Exercise: ClusterPractice Exercise: Cluster
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Cluster: Step 3 Cluster: Step 3 Cluster HH in cluster Cumulative # of
HHsRange
1 26 26 1-26
2 30 56 27-56
3 27 83 57-83
4 50 133 84-133
5 31 164 134-164
6 28 192 165-192
7 35 227 193-227
8 (etc. . . ) 42 269 228-269
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Cluster: Step 3Cluster: Step 3
• Sampling interval = cumulative # of HH divided by 25 clusters– Ex: 970/25 clusters = 39 (sampling interval)
• Randomly select number within sampling interval range– Ex: 01-39 = 31 is starting number
• Find where this number falls within range and cluster selected
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Cluster: Step 3, select 1st cluster Cluster: Step 3, select 1st cluster Cluster HH in cluster Cumulative # of
HHsRange
1 28 28 1-28
2 32 60 29-60
3 65 125 61-125
4 48 173 126-173
5 25 198 174-198
6 29 227 199-227
7 37 264 228-264
8 (etc. . . ) 34 298 265-298
31 falls within range
Cluster 2 selected for
sample
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Cluster: Step 3Cluster: Step 3
• Add sampling interval to first number: – Ex: 31 + 39 = 70
• Find where this number falls within range and cluster selected
• Continue until 25 clusters selected
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Cluster: Step 3, select 2nd clusterCluster: Step 3, select 2nd clusterCluster HH in cluster Cumulative # of
HHsRange
1 28 28 1-28
2 32 60 29-60
3 65 125 61-125
4 48 173 126-173
5 25 198 174-198
6 29 227 199-227
7 37 264 228-264
8 (etc. . . ) 34 298 265-298
70 falls within range
Cluster 3 selected for
sample
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Cluster: Step 3, select 3rd cluster Cluster: Step 3, select 3rd cluster Cluster HH in cluster Cumulative # of
HHsRange
1 28 28 1-28
2 32 60 29-60
3 65 125 61-125
4 48 173 126-173
5 25 198 174-198
6 29 227 199-227
7 37 264 228-264
8 (etc. . . ) 34 298 265-298
70 + 39=109 falls within
range
Cluster 3 selected again
for sample
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Random vs ClusterRandom vs Cluster
Advantage Disadvantage
Random • More precise• Smaller sample
size
• Complete HH listing• Could use more
resources • More travel/time
Cluster • No/incomplete
HH listing• Could use less
resources • Less travel
• Less precise• Larger sample size
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DRH Technical AssistanceDRH Technical Assistance
• Review sampling plan
• Consult on different sampling methods
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www.cdc.gov/reproductivehealth/Refugee
Reproductive Health Assessment Toolkit for Conflict-Affected WomenReproductive Health Assessment
Toolkit for Conflict-Affected Women