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Random Sampling. Simple Random samplingStratified random samplingQuota samplingArea samplingSystematic samplingCluster sampling30 clusters each of 7 individuals. Validity and sample Size. . . . . Sample. Target Population. External Population. . Validity. Sources of Distortion. Target Populat

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mother and child health research methods

Mother and Child Health: Research Methods

G.J.Ebrahim

Editor

Journal of Tropical Pediatrics, Oxford University Press.

random sampling
Random Sampling
  • Simple Random sampling
    • Stratified random sampling
    • Quota sampling
    • Area sampling
    • Systematic sampling
  • Cluster sampling
    • 30 clusters each of 7 individuals
validity and sample size
Validity and sample Size

External Population

Target Population

Sample

Validity

sources of distortion
Sources of Distortion

Target Population Subjects in catchment area

Identification Subjects referred

Contact Participation Follow-up

Final Study Sample

calculating sample size
Calculating Sample Size

Factors to consider are:

  • Effect Size
  • Acceptable Risk of False Positive (p < 0.05)
  • Power of the Study (cut-off is 80%)
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