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Biostatistics

Question
20 out of 76
 

True about cluster sampling are all except



A Sample size is same as that of simple random sampling

B It is a two stage sampling

C It is cheaper than other methods of sampling

D It has the disadvantage of higher sampling error

Ans. A Sample size is same as that of simple random sampling

Ref: Basic & Clinical Biostatistics; Dawson – Saunders & Trapp

  1. The sample size is never the same as that of simple random sampling in cluster sampling.
  2. In fact the sample size in cluster is twice or thrice that of SRS because of the phenomenon of Design Effect.
  3. The very reason for carrying out cluster sampling is for administrative & operational feasibility. In this method, instead of selecting individuals, a subset of clusters or groups are randomly selected and then all respondents or a pre-determined number of respondents in each cluster are included in the study.
  4. The result is considered to be statistically valid within the error limit of 10%. However the method is definitely less efficient to simple random sampling & requires a larger sample size, but in some situations it is the method of choice, such as in multicentric trials, in order to obtain adequate number of patients.
  5. Cluster sampling is most frequently used in immunization coverage evaluation surveys.

Biostatistics Flashcard List

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