Drawing a random national sample typically involves stepwise selection of areas, regions, provinces, cities/municipalities, barangays, dwellings, and one (or more, as needed) persons in the dwelling, ...

Previously, I described different sampling methods and explained why random sampling is an important component of researching treatments for COVID-19.

Why bother conducting experiments on treatments for COVID-19 (e.g., chloroquine) instead of relying on anecdotal evidence about their effectiveness? Random assignment is discussed.

Random assignment multicenter phase II study of modified docetaxel, cisplatin, fluorouracil (mDCF) versus DCF with growth factor support (GCSF) in metastatic gastroesophageal adenocarcinoma (GE).