Stratified sampling examples

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===Example 1===
  
 
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[[File:5.2.6-fig74.png|right|thumb|150px|Illustration why stratification is most efficient when the ''strata means''are as different as possible]]
 
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Imagine the example population of <math>N=30</math> elements be subdivided into three strata as in the figure on the right. Here, stratification has been done arbitrarily into three strata of size 14, 8 and 8.
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From this stratified population, we wish to take a sample of n=10, taking n1=4 from the first stratum and n2=n3=3 from the other two strata. The stratum parametric means and variances are given in Table 12.               
  
  

Revision as of 19:17, 16 December 2010

Example 1

Illustration why stratification is most efficient when the strata meansare as different as possible

Imagine the example population of \(N=30\) elements be subdivided into three strata as in the figure on the right. Here, stratification has been done arbitrarily into three strata of size 14, 8 and 8. From this stratified population, we wish to take a sample of n=10, taking n1=4 from the first stratum and n2=n3=3 from the other two strata. The stratum parametric means and variances are given in Table 12.

Construction.png sorry: 

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