The first video in Pew Research Center’s Methods 101 series helps explain random sampling – a concept that lies at the heart of all probability-based survey research – and why it’s important. Fresh ...

Our third Methods 101 video explores some of the ways that nonprobability surveys differ from traditional probability-based polls. How do pollsters conduct surveys online and what does that mean for ...

Journal of Marriage and Family, Vol. 44, No. 4, Methodology: The Other Side of Caring (Nov., 1982), pp. 965-981 (17 pages) To make further improvements in the quality of family research, an adequate ...

Ranked set sampling as suggested by McIntyre (1952, Journal of Agricultural Research 3, 385-390) and Takahasi and Wakimoto (1968, Annals of the Institute of Statistical Mathematics 20, 1-31) may be ...

The nuts and bolts of our public opinion surveys. A summary of ABC News' polling standards and survey methodology follows. ABC News maintains standards for disclosure, validity, reliability and ...

Sean Ross is a strategic adviser at 1031x.com, Investopedia contributor, and the founder and manager of Free Lances Ltd. Gordon Scott has been an active investor and technical analyst or 20+ years. He ...