Kamis, 25 Maret 2010

Sampling Techniques: Cluster Sampling

Cluster Sampling In cluster sampling the unit of sampling is not the individual but rather a naturally occurring group of individuals. Cluster sampling is used when it is more feasible or convenient to select groups of individuals than it is to select individuals from a defined population. This situation occurs when it is either impractical or impossible to obtain a list of all members of the accessible population. Suppose, for example, that one's defined population consists of all residents over the age of eighteen in a particular city. Simple random sampling or systematic sampling could be used if an up-to-date, complete census of all the city's individuals and their ages is available. If not, then cluster sampling is advisable.

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