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LIS 570

Selecting a Sample

 

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Summary

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Sampling - the process of selecting observations

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Aim

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Avoiding bias

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Basic terminology

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Step 1: Identify the Population

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Define the population concretely

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Example

 

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2.  Decide on a Census or a Sample

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Sample

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3.  Decide on Sampling Approach

 

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Random sampling

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Random samples

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Types of random sampling

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How to choose

 

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Simple random samples

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Systematic sampling

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Select from the sampling frame according to the sample fraction

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Must decide where to start

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Stratified sampling

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Cluster sampling

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Random Samples

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High probability that sample generally representative of the population on variables of interest

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Non-random Samples

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Selecting a sampling method

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Conclusion