Learn how representative samples and random samples differ and why combining them minimizes sampling bias for accurate data.

In a recently published news story, we learn about a young doctor, Jake Deutsch, and his personal experience with coronavirus disease 2019. Deutsch tested positive for Covid-19 and checked himself ...

Discover how to determine the ideal percentage of a population for a representative sample to ensure accurate data analysis with minimal sampling error.

A study by the universities of Cordoba and Seville develops a method that makes it possible to verify, easily and quickly, whether an olive plantation is traditional, intensive, or super-intensive.

The method of systematic random sampling (METHOD=SYS) selects units at a fixed interval throughout the sampling frame or stratum after a random start. PROC SURVEYSELECT chooses the first unit randomly ...

The method of simple random sampling (METHOD=SRS) selects units with equal probability and without replacement. Each possible sample of n different units out of N has the same probability of being ...

The analysis in this report is based on a web survey conducted January18-24, 2013 among a sample of 1,041 adults, 18 years of age or older. The survey was conducted by GfK Knowledge Networks (KN) ...

Spencer Kimball works for Emerson College Polling. Camille Mumford works for Emerson College Polling. As the U.S. presidential election approaches, news reports and social media feeds are increasingly ...