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Sampling Interval

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Sampling Interval

Sampling interval is the distance or time between which measurements are taken, or data is recorded. In research terms, also referred to as ‘nth selection’, this is when we select every nth participant (sampling unit) in the list; this sampling interval produces a random selection from throughout the total population. So if you had a total population of 10,000 and you wanted to get a sample of 2,000 you would select every 5th unit. This selection process could start on any number, for example the 1st, 6th, 11th unit and so on or the 3rd, 8th, 13th etc.

This random sampling technique is important in allowing researchers to have confidence in a sample that is more likely to be representative of the total target population than non-random sampling methods.

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