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CLUSTER SAMPLING AND INCIDENTAL SAMPLING

Presented by

SARANYA K S 1 Year M Ed

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CLUSTER SAMPLING

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PURPOSE

  • EFFICIENCY
  • COST EFFECTIVENESS
  • STUDY LARGE POPULATION

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  • EFFICIENCY

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  • COST EFFECTIVENESS

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  • STUDY LARGE POPULATION

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CLUSTER SAMPLING TECHNIQUES

  • Single – stage cluster sampling
  • Double –stage cluster sampling
  • Multi –stage cluster sampling

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HOW TO CLUSTER SAMPLE

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MULTI-STAGE SAMPLING

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ADVANTAGES

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  • COST EFFECTIVE

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  • TIME EFFICIENT

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  • EFFICENT FOR LARGE POPULATIONS

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DISADVANTAGES

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  • INTERNAL VALIDITY

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  • HIGHER SAMPLING ERRORS

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  • LOSS OF INFORMATION

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INCIDENTAL SAMPLING

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ADVANTAGES OF INCIDENTAL SAMPLING

  • COLLECT DATA QUICKLY

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ADVANTAGES (CONTINUE)

  • INEXPENSIVE TO CREATE SAMPLE

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  • EASY TO REASERACH

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DISADVANTAGES

  • Bias in sampling
  • Lack of variety
  • Unknown errors
  • External validity is limited

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DIFFERENCES BETWEEN CLUSTER AND INCIDENTAL

CLUSTER

  • Cost reduction
  • Randomly selected clusters
  • Division naturally formed
  • More error

INCIDENTAL

  • Easy to use
  • Quick
  • Cost effective
  • Useful for small population

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