Survey sampling and estimation methods form the cornerstone of modern statistical inference, underpinning research across the social, medical, and natural sciences. At their heart, these methods ...

Note: This report was updated on Dec. 30, 2015 to reflect the January-July 2015 National Health Interview Survey estimates released on December 1, 2015. Telephone surveys face numerous challenges, but ...

Detailed information on Pew Research Center international survey meethodology, such as mode of interview, sampling design, margin of error, and design effect, for each country we survey, organized by ...

Cochran (1977) outlines eleven steps in the planning of a survey. Good sampling methods must exist in the environment of all of these steps. These steps are (1) a statement of the survey objectives, ...

Collectively, recreational fisheries can take a significant fraction of the yearly catch—in some cases more than commercial fisheries. It is important that systems used to monitor fishing catch are ...

Children tap the legs for local seniors at an elderly care center in Deqing County of Huzhou City, east China's Zhejiang Province, Oct. 10, 2024. Photo: Xinhua The National Bureau of Statistics is set ...

MANILA, Philippines – The pre-election surveys of Pulse Asia and Social Weather Stations (SWS) are “statistically anomalous” for not following the acceptable survey sampling methods, senatorial bet ...