Sampling and Measurement - Other Probability Sampling Methods
4 important questions on Sampling and Measurement - Other Probability Sampling Methods
What is systematic random sampling and what is the difference from a simple random sample?
With a simple random sample, two subjects listed next to each other on the sampling frame list can both appear in the sample in contrary to a systematic random sample.
What is stratified random sampling and when is it called a proportional or a disproportional sample?
A proportional sample has the same strata proportions in the sample as in the population.
A disproportional sample differs from the population. This is useful when the population size for a stratum is very small.
When would you use cluster sampling and how does it work?
First, the population has to be divided into a large number of clusters, such as city blocks. Select a simple random sample of the clusters and use the subjects in those clusters as the sample.
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How does multistage sampling work?
- Select a random sample out of all countries (treated as clusters).
- Within each country selected, take a cluster random sample of square-block regions.
- Within each region selected, take a systematic random sample of every 10th house.
- Within each house selected, select one adult at random for the sample.
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