Representative vs. Random Samples: Key Differences Explained

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

When surveying small populations, some approaches are more inclusive than others

Survey researchers increasingly recognize that a single survey of the general public can rarely represent the views of small groups of Americans. Such surveys frequently have too few interviews with ...
The Telegraph

Random sample survey of nerve ailments

Worried at the increasing incidence of nerve disorders among Calcuttans, with hardly any data to provide a research backbone, the Indian Council of Medical Research (ICMR) has embarked upon a random ...
Simon Fraser University

Simple Random Sampling

The following PROC SURVEYSELECT statements select a probability sample of customers from the Customers data set using simple random sampling. title1 'Customer Satisfaction Survey'; proc surveyselect ...
Pew Research Center

Appendix A: Survey methodology

About Pew Research Center’s Spring 2025 Global Attitudes Survey Results for the survey are based on a mix of telephone, face-to-face and online interviews ...
Los Angeles Times

How the poll was conducted

The Los Angeles Times/USC College of Letters, Arts and Sciences poll is based on a random sample survey of 1,500 registered voters in California conducted between Oct. 27 and Nov. 3. All interviews ...
Los Angeles Times

POLL: Methodology

The findings of the Los Angeles Times/USC College of Letters, Arts and Sciences poll are based on a random sample survey of 1,506 registered voters in the state of California conducted from May 19 to ...