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　　2.3 Sampling methods
　　Data are often collected from a sample rather than from a population. If the whole population is examined, the survey is called a census.
 
　　There are two types of sampling methods:
　　Probability sampling method – is a sampling method in which there is a known chance of each member of the population appearing in the sample.
　　- Random
　　- Stratified random
　　- Systematic
　　- Multistage
　　- Cluster
　　If random sampling is used, it is necessary to construct a sampling frame.
 
　　A sampling frame should have following characteristics
　　- completeness
　　- accuracy
　　- adequacy
　　- up to dateness
　　- convenience
　　- non-duplication
　　Non probability sampling method – is a sampling method in which the chance of each member of the population appearing in the sample is not know, i.e. quota sampling.
 
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