Systematic sampling is straightforward and low risk, offering better control. However, it may introduce sampling errors and ...

A practical method of drawing sampling units with probabilities exactly proportional to size is described, in which both preliminary calculations and the addition of a large number of sizes are ...

Harnessing a pervasive type of cellular messenger shows early experimental promise as a routine way of sampling and monitoring the body’s response to prescription drug exposure. Purdue University-led ...

Sputum sampling was found to be a valuable method for diagnosing and monitoring patients with coronavirus disease 2019 (COVID-19), according to a recent systematic review and meta-analysis published ...