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Systematic sampling is a random method of sampling that applies a constant interval to choosing a sample of elements from the sampling frame. It is in common use in part because little training is needed to select one. Suppose a sample of size n is desired from a population of size N = nk. Systematic sampling uses a random number r between 1 and k to determine the first selection. The remaining selections are obtained by taking every kth listing thereafter from the ordered list to yield the sample of size n. Because it designates the number of records to skip to get to the next selection, k is referred to as the skip interval.

Systematic sampling is particularly desirable when on-site staff, rather than a ...

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