Stratified sampling examples
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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. | 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. | ||
| − | From this stratified population, we wish to take a sample of n=10, taking | + | |
| + | From this stratified population, we wish to take a sample of <math>n=10</math>, taking <math>n_1=4</math> from the first stratum and <math>n_2=n_3=3</math> from the other two strata. The stratum parametric means and variances are given in Table 1. | ||
Revision as of 19:22, 16 December 2010
Example 1
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 \(n_1=4\) from the first stratum and \(n_2=n_3=3\) from the other two strata. The stratum parametric means and variances are given in Table 1.
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