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Sampling with replacement

Definition

Sampling with replacement refers to the process of selecting individuals from a population in such a way that after each selection, the individual is put back into the population before the next selection.

Analogy

Think of sampling with replacement like buying raffle tickets at an event. Each time you buy a ticket, your name goes back into the pool for another chance to win. So even if you've won before, you still have an opportunity to win again.

Related terms

Sampling without replacement: In contrast to sampling with replacement, sampling without replacement means that once an individual is selected from a population, they are not put back before making subsequent selections.

Cluster sampling: Cluster sampling involves dividing the entire population into smaller groups or clusters and then randomly selecting some clusters to include in the sample. This method is often used when it is difficult or impractical to sample individuals directly.

Systematic sampling: Systematic sampling involves selecting individuals from a population at regular intervals, such as every 10th person. This method can be efficient and convenient when the population is already ordered in some way.