sadc course in statistics to the woods discussion (sessions 10)
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SADC Course in Statistics
“To the Woods” discussion
(Sessions 10)
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Learning Objectives
By the end of this session, you will be able to
• discuss the gains in precision with stratification compared to simple random sampling and the circumstances under which such gains can be expected
• have an appreciation of the correct computation of a ratio estimate
• recognise why estimating a ratio is different from estimating a proportion
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Session contents
• Discussion of results from the “To the Woods” exercise using a selected data set
• Post-stratification – can this be done if scheme A had been adopted? How?
• Revision of ideas of simple and stratified random sampling
• Discussion of how ratio estimates may be calculated and how they differ from estimating population proportions based on a fixed sample size.
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Post-stratification: exercise
• In small groups, there will be a discussion of ways in which results from Scheme A can be used to improve the estimation
• You will then attempt to produce such estimates and compare it with previous results of Scheme A.
• A discussion will follow.
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