Stratified sampling examples
From AWF-Wiki
(Difference between revisions)
(Created page with " {{Construction}} Category:Forest Inventory Examples") |
|||
| Line 1: | Line 1: | ||
| + | ===Example 1=== | ||
| − | + | [[File:5.2.6-fig74.png|right|thumb|150px|Illustration why stratification is most efficient when the ''strata means''are as different as possible]] | |
| − | + | ||
| + | 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 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 18:17, 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 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.
 |
sorry: |
This section is still under construction! This article was last modified on 12/16/2010. If you have comments please use the Discussion page or contribute to the article! |
