Transcript Multi-Stage Cluster Sampling

Sampling
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1
Target Population and Sampling Frame
• Specification of population of interest is the
most important step.
• Sampling frame should enumerate that
population
– Target population
• Shoppers at Santa Monica Place
– Sampling Frame
• Time? Place?
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2
Target Population and Sampling Frame
• The United States Army begins a national
search for eligible recruits.
• A professional golfer begins a national
campaign to sell his latest instructional
video.
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Sample Size
• “How” you sample is much more important
than “How many” you sample.
• “How”
– Probability samples
– Non Probability samples
• “How many”
– Statistical precision
– Industry standards
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Simple Random Sampling
• Make a list
– Articulate the sampling frame
• Roll the dice
– Equally likely elementary events
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Multistage Cluster Sampling
• Lay out primary clusters
– Sample randomly
• Lay out secondary clusters
– Sample randomly
• etc.
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P rim a ry
S e co n d a ry
C lu s te rs
C lu s te rs
1
S im p le R a n d o m
S a m p l in g w i th in S e c o n d
1
2
2
3
3
4
5
4
5
6
7
8
6
7
9
1 0
1 1
8
9
1 2
1 3
1 4
1 0
1 5
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Sample Weighting
Cluster 1 Sample 1
97
117
117
93
98
98
122
122
83
111
87
118
118
118
116
109
109
119
80
80
111
90
90
83
105
105
97
97
102
102
101
101
108
108
115
101
101
92
92
Average
Unweighted
Average
Weighted
Average
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102.9
102.9
94.8
90.8
Cluster 2 Sample 2
54
54
110
110
108
89
80
80
98
98
109
56
56
73
73
73
73
53
53
69
69
78
78
97
97
91
96
96
104
104
60
60
101
84.2
78.6
92.1
8