Sampling techniques are discussed.True experiments, unlike anecdotal evidence, often require random sampling and random assignment. In this post, I try to explain the importance of random sampling ...

In this post, I try to explain the importance of random sampling; in my next post, I will explore random assignment. Let me use an (oversimplified) example: Suppose there are 2 million Americans ...

In simple random sampling, each unit has an equal probability of selection, and sampling is without replacement. Without-replacement sampling means that a unit cannot be selected more than once.

Scott E. Carrell, James E. West, Does Professor Quality Matter? Evidence from Random Assignment of Students to Professors, Journal of Political Economy, Vol. 118, No. 3 (June 2010), pp. 409-432 ...

The classical argument for random assignment of treatments is viewed by many as enabling evaluation under weak assumptions, and it has generated much interest in the conduct of experiments. But the ...

A statistically designed random sampling scheme, based on as few as 100 people, would give a very high probability of detecting if there are any COVID-19 cases and highlight at-risk hotspots.

Postconsolidation immunotherapy including dinutuximab, granulocyte-macrophage colony-stimulating factor, and interleukin-2 improved outcomes for patients with high-risk neuroblastoma enrolled on the ...

To examine stability versus change in parental understanding of random assignment in randomized clinical trials (RCTs) for pediatric leukemia and to identify factors associated with changes in ...