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The sampling method, joining a chorus of "adaptive" research methods world-wide, is drawn from the concept of "species-area graphs" and is an adaptation of quadrat or area sampling common in the field of ecology.
Because the protective effects of vaccination at the individual level are best measured by household data (2), we conducted a retrospective household survey involving 1,614 nonrandomly sampled households (i.e., based on area sampling of households across Japan, according to the regional population size, with a total of 6,356 household members), in which the earliest cases were diagnosed from October 2009 to mid-February 2010.
The Rigid Hornwort was discovered during random area sampling organised by the Botanical Society of the British Isles.