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PRESENTED BY�SEETHA LAKSHMI V�FIRST YEAR M.ED

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Multistage SAMPLING�&� Purposive Sampling

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What is Multistage Sampling?�

Multistage sampling is a method of selecting a sample from a population by using multiple stages of sampling.

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Multistage sampling

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STEPS IN MULTISTAGE SAMPLING

Divide the Population

Select Clusters

Divide Selected Clusters

Select Final Sample

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PURPOSE

  • To reduces costs
  • To increase efficiency
  • To improve accuracy

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MULTISTAGE �SAMPLING �TECHNIQUES�

  • Cluster Sampling
  • Stratified Sampling
  • Systematic Sampling
  • Random Sampling

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ADVANTAGES

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  1. Cost-effective
  2. Increased efficiency
  3. Improved accuracy

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  • Sampling error
  • Intra-cluster correlation
  • Cluster size variability

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What is Purposive Sampling?�

Purposive sampling is a method of

selecting a sample from

a population by using a non-random,

purposeful selection of elements.

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Types of Purposive Sampling�

  • Convenience sampling
  • Snowball sampling
  • Quota sampling

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ADVANTAGES

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  • Allows for the selection of specific elements
  • Can be used to select elements that are representative of the population

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DISADVANTAGES

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  • Bias in the selection of elements
  • Limited generalizability
  • Lack of randomness

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