Sequential Sampling
Sequential sampling involves selecting every nth case from a list, providing a systematic way to gather data. This method is simple and efficient for obtaining a representative sample from an ordered list.
Use this method when you have a readily available list of individuals or items and need a quick, unbiased sample.
Solves: Potential bias if the list has an underlying pattern that coincides with the sampling interval; Difficulty in ensuring representation of all subgroups.
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Step 1: Obtain a complete list of the population of interest. (5 min)
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Step 2: Determine the sampling interval (n) based on the desired sample size. (5 min)
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Step 3: Select every nth case from the list, starting from a randomly chosen point. (10 min)
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Step 4: Analyze the selected cases. (10 min)
- Ensure the list is complete and accurate.
- Randomly select the starting point to avoid bias.
- Use a stratified approach to ensure representation of different subgroups.
- Adjust the sampling interval to achieve the desired sample size.