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Stratification & Sample Allocation

Stratification is the process of regrouping similar PSUs into sub-groups (strata).

Effects: better precision, flexible design, small sub-population coverage (or over sampling).

How to do stratification? (region) X (residence type)

Sample allocation: proportional, power allocation, equal size allocation (if budget is too tight).

Implicit stratification: sort the sampling frame according to certain characters such as regions, urban-rural residence, sub-regions, districts, etc.., then select a  pps sample.

There is no unique rule for stratification, it depends on country situation  

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